How to Choose CBD Oil for Your Pet: 7 Questions to Ask Before Buying

Why Choosing the Right CBD Product Matters

Interest in CBD for pets has grown dramatically since 2020, and with it the number of brands competing for your attention. A 2020 study published in the journal Frontiers in Veterinary Science found that among CBD products tested from the US market, a significant proportion contained less CBD than labelled, and some contained THC at levels above the stated threshold. While this study examined the US market, independent testing of European products has revealed similar inconsistencies.

The consequence is not just wasted money — incorrect THC levels can cause genuine harm, particularly in cats and small dogs. And a product without veterinary-informed dosing guidance is, at best, a guess. Asking the right questions before you buy is not overcaution; it is basic consumer due diligence in an unregulated space.

Below are the seven questions every pet owner should ask — and why the answers matter.

Question 1: Does the Brand Publish Per-Batch Certificates of Analysis (COA)?

A Certificate of Analysis (COA) is an independently verified laboratory report that confirms what is — and is not — in a specific product batch. The key word here is per-batch. A single COA from a year ago proves nothing about the product on the shelf today; hemp extract composition varies between harvests, and manufacturing consistency is not guaranteed.

A credible COA from an accredited third-party laboratory should confirm:

• CBD concentration matches the label claim (label accuracy failures of 20–50% are not uncommon in unregulated markets)
• THC content below the legal threshold
• No heavy metals (lead, mercury, arsenic, cadmium)
• No pesticide or herbicide residues
• No residual solvents from the extraction process

Some brands do not publish per-batch Certificates of Analysis — meaning you have no way to verify THC content or CBD concentration in the specific product you are purchasing. This is a significant red flag. Look for a QR code or batch number on the packaging that links to the corresponding COA, and verify the report is dated within the current production cycle.

Question 2: Is THC Confirmed Below 0.3%?

THC (tetrahydrocannabinol) is the psychoactive compound in cannabis. It is the reason cannabis products cause intoxication in humans — and it is significantly more dangerous to pets. Dogs have a higher density of CB1 receptors in the cerebellum than humans, making them more sensitive to THC's neurological effects. Cats have additional metabolic vulnerabilities due to their reduced glucuronidation enzyme capacity.

THC toxicity in pets can cause ataxia (loss of coordination), vomiting, urinary incontinence, and in severe cases, seizures or respiratory depression. These effects can occur at exposures that would be unremarkable for a human.

The EU and UK legal threshold for hemp-derived products is 0.3% THC by weight. This threshold is a legal standard, not a safety threshold for pets — even "compliant" products near the 0.3% boundary should be used cautiously in cats and toy breeds. Verify the exact figure on the COA, not just the marketing claim on the label.

Question 3: Is the Product Registered Under EU Complementary Feedstuff Regulations?

This is the question most pet owners have never thought to ask — and it may be the most important one.

In the European Union, products marketed as feed supplements for pets fall under Regulation (EC) No 767/2009 on the placing on the market and use of feed. Complementary feedstuffs for companion animals must comply with permitted ingredient catalogues, labelling requirements, and safety standards established under EU animal nutrition law. Registration under these regulations means a product has undergone a degree of regulatory scrutiny that a standard "supplement" does not.

Many CBD pet products sold online are not registered under EU complementary feedstuff regulations — they exist in a regulatory grey area. This does not necessarily mean they are unsafe, but it does mean they have not been subject to the ingredient verification, labelling standards, and manufacturing compliance that formal EU animal nutrition registration requires.

When a brand states that their product is formulated in compliance with EU complementary feedstuff regulations, that is a meaningful claim. Ask for documentation or look for it stated explicitly in the product information.

Question 4: Was the Formula Developed With Veterinary Oversight?

Formulating a supplement for animal use is not the same as formulating one for humans. Pet physiology differs from human physiology in ways that directly affect supplement design: cannabinoid metabolism rates vary by species, carrier oils interact differently with feline and canine GI systems, and bioavailability data from human studies does not translate directly to pet dosing.

A veterinary-approved formulation — vet-guided and science-backed — provides meaningful assurance that the product's design reflects animal physiology research rather than a human-grade product repurposed for pets. Without veterinary formulation oversight, dosing guidelines may be based on marketing rather than animal physiology research.

Ask whether the brand works with qualified veterinary professionals in product development, and whether the dosing guidance they provide is referenced to published research or clinical data. If the answer is vague or unavailable, treat that as informative.

Question 5: Are Dosing Guidelines Based on Animal Physiology Research?

This follows directly from Question 4. A 2018 study by Gamble et al. at Cornell University (PMID 30020864) established that 2 mg/kg twice daily was a clinically effective and well-tolerated dose for dogs with osteoarthritis — but this is a dog-specific finding derived from a controlled trial. It cannot be scaled arbitrarily to cats, rabbits, or very small breeds.

A 2019 pharmacokinetics study (PMID 31123969) further clarified how CBD is absorbed, distributed, and eliminated in dogs — findings that inform appropriate formulation and dosing interval decisions. Brands that cite specific research when explaining their dosing protocols are demonstrating scientific grounding. Brands that offer only a generic "give X drops per day" instruction without explanation are not.

Good dosing guidance should account for body weight, administration frequency, the specific condition being addressed, and species-specific metabolic differences. It should also recommend starting low and titrating gradually — consistent with how all responsible clinical CBD protocols are structured.

Question 6: Are Ingredients High Quality — Natural, With Omega 3 & 6 and Added Vitamins?

CBD does not exist in isolation in a supplement. The carrier oil, additional ingredients, and overall formulation quality all affect both safety and efficacy. For pet CBD products, look for:

• Natural hemp-based extract: the CBD should derive from organically grown hemp, without solvent contamination in extraction
• Omega 3 and Omega 6 fatty acids: essential fatty acids with well-documented anti-inflammatory, coat-health, and cognitive benefits in both dogs and cats. Their presence alongside CBD can produce complementary effects on inflammation and joint health
• Added vitamins: particularly vitamin E (an antioxidant that helps preserve hemp extract stability and supports immune function) and B-complex vitamins relevant to neurological health
• No artificial colours, flavours, or preservatives: additives that serve no functional purpose in pet supplements and introduce unnecessary exposure risk

Products manufactured outside the EU are subject to different (often looser) standards than EU-regulated pet nutrition products. European manufacturing under EU animal nutrition law comes with formal quality controls that add a meaningful layer of assurance.

Question 7: Is There a Money-Back Guarantee?

This question is often treated as a nice-to-have. It is actually a meaningful quality signal. A brand willing to offer a 30-day money-back guarantee is demonstrating confidence that their product will deliver a noticeable result — confidence grounded in either clinical data, consistent customer experience, or both.

In an unregulated market where product quality is difficult to assess from the outside, the guarantee also serves as consumer protection. If your pet shows no benefit after a properly administered trial period, you can recoup your investment rather than absorbing a loss on an ineffective product.

Combined with per-batch COA transparency and regulatory compliance, a money-back guarantee is one of the more reliable proxy indicators that a brand is operating with integrity.

A Final Note on Consultation

No checklist replaces a conversation with your vet. CBD interacts with the CYP450 enzyme system, which metabolises many veterinary medications including phenobarbitone, NSAIDs, and certain antibiotics. If your pet is on any existing medication, a brief veterinary consultation before starting CBD is not optional — it is medically appropriate. The American Veterinary Medical Association (AVMA) has published guidance for veterinarians on cannabis-derived products that may be useful background reading for these conversations.

The questions in this guide are designed to help you arrive at that veterinary conversation as an informed consumer — knowing what you are considering, and why the specific product you've chosen represents a quality choice.

References

1. Gamble LJ, et al. "Pharmacokinetics, Safety, and Clinical Efficacy of Cannabidiol Treatment in Osteoarthritic Dogs." Frontiers in Veterinary Science. 2018. PubMed 30020864
2. Bartner LR, et al. "Pharmacokinetics of cannabidiol administered by 3 delivery methods at 2 different dosages to healthy dogs." Can J Vet Res. 2019. PubMed 31123969

Written by Sarah Bennett, Certified Animal Nutritionist. Reviewed by a licensed veterinarian. Last updated June 2026. This article is for informational purposes only and does not constitute veterinary medical advice. Always consult a qualified veterinarian before making changes to your pet's health regimen.