Ask the Vet: Top 10 CBD Questions Answered by Dr. McGrath

ABSC Organics Team |
March 4, 2026 |
Reading Time: 11 minutes

When it comes to giving your pet CBD, you want answers from someone who has done the actual science, not just someone selling a product. That is why we compiled the ten most common veterinarian cbd questions we hear from pet owners and addressed them using insights informed by the clinical research conducted at Colorado State University, one of the most respected veterinary programs in the world.

Dr. Stephanie McGrath, a board-certified veterinary neurologist at CSU’s James L. Voss Veterinary Teaching Hospital, has led some of the most rigorous clinical trials ever conducted on CBD in companion animals. ABSC Organics has been proud to support three of these clinical trials, and the data they have produced is reshaping how veterinarians think about cannabinoid therapy for pets.

Below, we address each question with the depth and nuance it deserves. If your veterinarian has been hesitant to discuss CBD, consider sharing this article with them. The science has advanced considerably, and these are the kinds of evidence-based answers that can move the conversation forward.

Question 1: Is CBD Safe for Dogs and Cats?

The Short Answer

Yes, when administered at appropriate doses and sourced from a reputable manufacturer, CBD has been shown to be well tolerated in both dogs and cats.

The Evidence

The CSU clinical trials evaluated CBD safety across multiple study periods and dose ranges. In a 2019 pharmacokinetic and safety study published in the Journal of the American Holistic Veterinary Medical Association, dogs receiving CBD oil orally showed no clinically significant adverse effects on liver enzymes, kidney values, or complete blood count parameters over the study period.

A separate CSU study examining CBD in cats found similar safety results, with oral CBD oil being well absorbed and tolerated without serious adverse events.

The key caveats are:

• Quality matters enormously. CBD products contaminated with heavy metals, pesticides, or excessive THC can be harmful. This is why USDA Organic certification and third-party lab testing are non-negotiable.
• Dose matters. While CBD has a wide safety margin, extremely high doses can cause lethargy, gastrointestinal upset, or elevated liver enzymes. Stick to recommended ranges.
• Individual variation exists. Just as some humans are more sensitive to medications than others, some animals may respond differently to CBD.

What Veterinarians Should Know

The American Veterinary Medical Association (AVMA) has acknowledged the growing body of research on CBD and has advocated for veterinarians’ right to discuss cannabis-based products with clients. While the FDA has not approved CBD for veterinary use, the safety data from controlled clinical trials is substantial and growing.

Question 2: What Conditions Can CBD Help With in Pets?

The Short Answer

The strongest clinical evidence supports CBD use for pain management (particularly osteoarthritis), seizure reduction, and anxiety. Emerging research explores its potential for allergies, inflammatory bowel disease, and cancer-related symptoms.

The Evidence

Here is a breakdown of the current evidence by condition:

Osteoarthritis and Pain: A landmark 2018 study from Cornell University demonstrated that CBD oil at 2 mg/kg twice daily significantly reduced pain and increased activity in dogs with osteoarthritis, as measured by validated veterinary pain scales. CSU’s research has reinforced these findings.

Epilepsy and Seizures: Dr. McGrath’s pivotal CSU study on CBD for canine epilepsy, published in the Journal of the American Veterinary Medical Association, found that 89 percent of dogs receiving CBD experienced a reduction in seizure frequency. This was one of the first randomized, placebo-controlled, double-blinded veterinary CBD studies ever conducted.

Anxiety: While large-scale controlled studies on CBD for pet anxiety are still in progress, the pharmacological mechanisms are well understood. CBD interacts with serotonin receptors (5-HT1A) and modulates the stress response through the endocannabinoid system. Preliminary studies and extensive anecdotal reports from thousands of pet owners support its anxiolytic effects.

Allergies and Skin Conditions: CBD’s anti-inflammatory properties, documented in numerous preclinical studies, suggest potential benefit for atopic dermatitis and other inflammatory skin conditions. Clinical trials specifically focused on canine allergies are ongoing.

Cancer: Preclinical research has shown that CBD can inhibit tumor cell growth and promote apoptosis in certain cancer cell lines. However, clinical trials in veterinary oncology are in early stages, and CBD should not be considered a cancer treatment. It may help manage cancer-related pain, nausea, and appetite loss.

Question 3: How Does CBD Work in the Body?

The Short Answer

CBD interacts with the endocannabinoid system (ECS), a biological network present in all mammals that regulates pain, mood, immune function, appetite, and homeostasis.

The Science

The endocannabinoid system consists of three main components:

1. Endocannabinoids: Naturally produced compounds (anandamide and 2-AG) that bind to cannabinoid receptors.
2. Receptors: CB1 receptors (primarily in the brain and nervous system) and CB2 receptors (primarily in immune tissues and peripheral organs).
3. Enzymes: FAAH and MAGL, which break down endocannabinoids after they have served their purpose.

CBD does not bind directly to CB1 or CB2 receptors the way THC does. Instead, it works through several indirect mechanisms:

• Inhibiting FAAH, which increases levels of anandamide (the “bliss molecule”)
• Activating 5-HT1A serotonin receptors, contributing to anxiolytic and anti-nausea effects
• Modulating TRPV1 receptors, which are involved in pain and inflammation signaling
• Interacting with GPR55 receptors, which play a role in bone health and blood pressure regulation
• Reducing the activity of inflammatory pathways including NF-kB

This multi-target mechanism of action is one reason CBD appears to have such a broad range of potential therapeutic applications.

Question 4: What Is the Right Dose of CBD for My Pet?

The Short Answer

Most veterinary research supports starting at 1 to 2 mg of CBD per kilogram of body weight, administered twice daily, with gradual adjustment based on response.

Dosing Guidelines Informed by Research

The titration principle: Start low, go slow. Begin at the lower end of the range, maintain that dose for 7 to 10 days, and assess your pet’s response. If improvement is insufficient, increase by 25 percent and reassess. The goal is to find the minimum effective dose.

The CSU clinical trials found that CBD administered in an oil carrier (such as MCT or hemp seed oil) provided the most consistent absorption. This is exactly how ABSC Organics formulates its products.

Question 5: Are There Any Side Effects?

The Short Answer

Side effects are generally mild and dose-dependent. The most commonly reported include mild sedation, softer stools, and dry mouth.

What the Clinical Data Shows

Across the CSU clinical trials and other published veterinary CBD studies, the following side effects have been documented:

• Mild sedation or lethargy: Most common at higher doses, often resolves within the first few days or with dose reduction.
• Gastrointestinal changes: Softer stools or mild diarrhea, particularly during the initial adjustment period.
• Dry mouth: Some pets may drink more water than usual.
• Elevated alkaline phosphatase (ALP): The CSU studies noted mild, clinically insignificant increases in the liver enzyme ALP in some dogs. This did not correspond to liver damage but is worth monitoring with periodic blood work, especially in pets on long-term CBD supplementation.

Serious adverse effects were not observed in any of the controlled clinical trials when CBD was administered at recommended doses.

Question 6: Can CBD Interact with My Pet’s Medications?

The Short Answer

Yes, CBD can interact with certain medications. Always consult your veterinarian before starting CBD if your pet is on any prescription drugs.

The Pharmacology

CBD is metabolized by the cytochrome P450 enzyme system in the liver, specifically the CYP2D6 and CYP3A4 pathways. Many pharmaceutical drugs are metabolized by these same enzymes, which means CBD can potentially alter how quickly those drugs are processed.

Medications of particular concern include:

• Anti-seizure medications (phenobarbital, potassium bromide, zonisamide): CBD may affect serum levels of these drugs, requiring dose adjustments. Dr. McGrath’s research specifically explored this interaction in the epilepsy trials.
• NSAIDs (carprofen, meloxicam): Both CBD and NSAIDs have anti-inflammatory effects, and there may be additive effects on liver metabolism.
• Sedatives and anesthetics: CBD’s mild sedative properties could compound sedation from other drugs.
• Immunosuppressants (cyclosporine): CBD may increase blood levels of cyclosporine by inhibiting its metabolism.

The presence of a potential interaction does not necessarily mean CBD cannot be used. It means veterinary oversight is essential. In many cases, dose adjustments can be made to safely combine CBD with conventional medications.

Question 7: Does It Matter If CBD Is Organic?

The Short Answer

Absolutely. USDA Organic certification is one of the most important quality indicators for pet CBD products.

Why Organic Matters

Hemp is a bioaccumulator, meaning it absorbs substances from the soil and water it grows in. This includes beneficial minerals, but it also includes pesticides, heavy metals, and other contaminants. Non-organic hemp grown in contaminated soil or treated with synthetic chemicals can concentrate those toxins in the final CBD extract.

For pets, whose smaller body weight means a higher dose-per-pound ratio than humans, contaminant exposure is a more serious concern. USDA Organic certification guarantees:

• No synthetic pesticides or herbicides were used in cultivation
• No synthetic fertilizers were applied
• The soil has been free from prohibited substances for at least three years
• Every step of processing meets federal organic standards
• The certification is verified through annual inspections and audits

ABSC Organics is one of the very few pet CBD brands to hold USDA Organic certification. This is not a marketing claim; it is a federally regulated standard enforced by the USDA National Organic Program.

Question 8: How Long Does It Take for CBD to Work?

The Short Answer

For acute effects (such as anxiety relief before a car ride), 30 to 60 minutes. For chronic conditions (such as arthritis or ongoing anxiety), one to four weeks of consistent daily dosing.

Understanding Onset and Duration

When CBD oil is administered orally, it passes through the digestive system and is absorbed through the intestinal lining. Peak blood levels are typically reached within one to two hours after administration.

The duration of effect varies by individual but generally ranges from four to eight hours, which is why twice-daily dosing is recommended for most conditions.

For chronic conditions, the full therapeutic benefit often builds over time. This is because consistent CBD supplementation supports ongoing endocannabinoid system regulation rather than producing a one-time effect. The CSU clinical trials demonstrated that sustained improvement was observed with consistent dosing over the study periods, supporting the principle of patience and regularity.

Practical timeline expectations:

• Days 1-3: You may notice mild sedation or calming effects. This is the adjustment period.
• Days 4-7: Initial behavioral changes may become apparent, particularly for anxiety.
• Weeks 2-3: More significant improvements in pain, mobility, or chronic anxiety often emerge.
• Week 4 and beyond: Full therapeutic potential is typically realized. If no improvement is seen by week four, consider increasing the dose or consulting your veterinarian.

Question 9: Is CBD Oil Better Than CBD Treats for Pets?

The Short Answer

CBD oil generally offers better bioavailability, more precise dosing, and faster onset of action compared to CBD-infused treats.

The Comparison

CBD Oil Advantages:

• Precise dosing: A calibrated dropper allows you to measure exact milligram amounts, which is critical for small pets or conditions requiring specific dose targets.
• Better absorption: Oil-based CBD can be partially absorbed through the oral mucosa (gums), bypassing first-pass liver metabolism and reaching the bloodstream faster.
• Fewer additives: Pure CBD oil in an organic carrier contains no fillers, preservatives, or artificial flavors.
• Flexible dosing: Easy to adjust up or down in small increments.

CBD Treat Drawbacks:

• CBD must pass through the full digestive process before absorption, reducing bioavailability.
• Treats often contain inconsistent CBD distribution (some treats may have more or less than the labeled amount).
• Additional ingredients (flour, sugar, artificial flavors) may not align with your pet’s dietary needs.
• Difficult to dose precisely for very small or very large pets.

All ABSC Organics products are delivered in oil form specifically because the CSU clinical trials used oil-based administration and demonstrated reliable absorption using this delivery method.

Question 10: How Do I Talk to My Veterinarian About CBD?

The Short Answer

Approach the conversation with respect for your vet’s expertise, come prepared with specific questions, and share the clinical research.

A Practical Script

Many pet owners find that their veterinarian is cautious about CBD. This caution is understandable: until recently, there was very little peer-reviewed research to guide clinical recommendations. Regulatory constraints in some states have also limited what veterinarians can legally say about cannabis-based products.

Here is how to have a productive conversation:

1. Lead with your pet’s symptoms. Instead of saying “I want to try CBD,” start with “Bella has been increasingly stiff on walks, and I am looking at all our options for managing her arthritis pain.”
2. Ask specific questions. “Are you familiar with the Colorado State University studies on CBD for dogs? What are your thoughts on the safety data?”
3. Share the research. Bring printouts or links to the published CSU studies. Dr. McGrath’s work has been published in peer-reviewed journals that any veterinarian can access.
4. Ask about interactions. “Bella is currently on carprofen. Would CBD interact with that?”
5. Discuss monitoring. “Would you be willing to monitor Bella’s blood work if we try a CBD trial? I want to make sure we are being thorough.”
6. Respect the answer. If your vet says no, ask why and whether they can recommend a colleague who has more experience with cannabinoid therapy.

Increasingly, veterinary professional organizations are acknowledging the evidence behind CBD. The AVMA has called for more research, and several state veterinary medical boards have issued guidance allowing vets to discuss CBD with clients.

Bonus: Three Questions Your Veterinarian Might Ask YOU

If your vet is open to discussing CBD, they may have questions of their own. Here is how to be prepared:

“What product are you using?”

Be specific. Share the brand name, concentration, and any third-party lab results. If you are using ABSC Organics, you can point to our USDA Organic certification, our published certificates of analysis, and our involvement in three CSU clinical trials.

“What dose are you giving?”

Know your pet’s weight, the CBD concentration of your product, and the exact milligram dose you are administering. This allows your vet to evaluate whether the dose is within an appropriate range.

“Have you noticed any changes?”

Keep a daily log of your pet’s behavior, appetite, energy level, and any symptoms you are tracking. Objective data is far more useful than general impressions when evaluating treatment efficacy.

The Bigger Picture: Where Veterinary CBD Research Is Headed

The veterinarian cbd questions we receive today are far more sophisticated than the ones we heard five years ago. This reflects the rapid maturation of the field. Here are some of the research directions currently underway:

• Canine cancer trials: Several universities are investigating CBD as an adjunctive therapy in canine oncology.
• Feline-specific pharmacokinetics: Better understanding of how cats metabolize CBD will lead to more precise dosing guidelines for feline patients.
• Long-term safety data: Extended studies tracking pets on CBD for years will provide valuable safety information for chronic use. (For more on this topic, see our article on long-term CBD use in dogs.)
• Combination therapies: Research exploring how CBD can be safely combined with conventional medications to improve outcomes while potentially reducing side effects of pharmaceutical drugs.
• Standardized veterinary dosing protocols: As the evidence base grows, we can expect the development of formal veterinary dosing guidelines similar to those that exist for conventional pharmaceuticals.

ABSC Organics is committed to supporting this research. Our partnerships with university researchers, our investment in clinical trials, and our commitment to USDA Organic quality standards all reflect our belief that the future of pet CBD must be science-first.

A Final Word

The conversation between pet owners and their veterinarians about CBD has evolved enormously. What was once a fringe topic is now the subject of peer-reviewed research, university clinical trials, and mainstream veterinary discourse. The questions have gotten better. The answers have gotten more evidence-based. And pets across the country are benefiting from this progress.

If you have been hesitant to bring up CBD with your veterinarian, or if you have been using CBD without veterinary guidance, we encourage you to start that conversation. Come prepared with the facts. Share the research. And choose a product that your veterinarian can feel confident about.