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CBD dosage for dogs by weight: how much is right?
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Published canine studies dose by body weight, most often at 2 mg/kg every 12 hours, the regimen used in a 2018 Cornell trial and a 12-week safety study (Frontiers in Veterinary Science). That equals 0.9 mg per pound, or 18 mg per dose for a 20 lb dog. Lower starting points of 0.25 to 1 mg/kg appear elsewhere.
Dog dosing is one of the few corners of CBD where published studies used a specific, repeatable number. That number is a milligrams-per-kilogram figure, which means the right amount for a dog is a weight calculation, not a number of drops.
What dose did the canine studies use?
The most-cited regimen is 2 mg/kg every 12 hours. A 2018 Cornell trial published in Frontiers in Veterinary Science gave client-owned dogs 2 mg/kg of CBD oil every 12 hours for 4 weeks in a placebo-controlled crossover; the same group's pharmacokinetic work in 4 beagles tested 2 and 8 mg/kg and found a median elimination half-life of 4.2 hours at both doses. A separate 12-week study in Animals gave 8 beagles 2 mg/kg twice daily as a soft chew and recorded peak blood levels of 301 ng/mL about 1.4 hours after dosing.
The short half-life is why every one of these studies doses twice a day. A dog clears CBD within hours, so once-daily dosing leaves most of the day without it.
The literature also includes lower regimens. A 2021 review in Animals lists canine studies ranging from 0.25 mg/kg once daily to 2.5 mg/kg every 12 hours, and single pharmacokinetic doses as high as 180 mg orally. The upper safety boundary comes from a 2020 escalation study in Frontiers in Veterinary Science, in which 20 beagles received CBD oil at increasing doses up to about 62 mg/kg with only mild adverse events and no moderate or severe ones in the CBD group.
How does mg/kg convert to a dog's weight?
Divide the dog's weight in pounds by 2.2 to get kilograms, then multiply by the chosen mg/kg. The table shows the arithmetic for the two most-cited starting points.
| Dog weight | Kilograms | 1 mg/kg per dose | 2 mg/kg per dose |
|---|---|---|---|
| 10 lb | 4.5 kg | 4.5 mg | 9 mg |
| 20 lb | 9.1 kg | 9 mg | 18 mg |
| 40 lb | 18.2 kg | 18 mg | 36 mg |
| 60 lb | 27.3 kg | 27 mg | 55 mg |
| 80 lb | 36.4 kg | 36 mg | 73 mg |
| 100 lb | 45.5 kg | 45 mg | 91 mg |
Each figure is one dose; the studies gave it twice daily. To turn a dose into a dropper volume, divide by the tincture's concentration. A 1000 mg, 30 mL tincture is 33 mg/mL, so an 18 mg dose is about 0.55 mL.
Why start lower than the study dose?
Because the studies were run in controlled settings with blood monitoring, and a household is not. The Cornell trial found alkaline phosphatase, a liver enzyme, rose in 9 of 16 dogs over 4 weeks at 2 mg/kg; the authors called the significance uncertain and recommended monitoring liver values. The 12-week study saw loose stool in about 3.3 percent of observation periods. Neither is alarming, and both are the reason a conservative household approach starts at 0.5 to 1 mg/kg, holds for a week, and moves toward 2 mg/kg only if the dog tolerates it.
Veterinary input matters here more than in adult self-dosing. FDA states that it has not approved cannabis for any use in animals, and a dog on other prescriptions shares the liver enzyme pathways CBD uses. In the words of the 2021 veterinary review, "the available data suggest that CBD may be well tolerated by animals," with the caveat that product quality control is the weak link.
What should the label and COA show?
Total CBD per bottle, bottle volume, and ideally mg per mL printed outright. The certificate of analysis should confirm potency, show THC as ND or at a stated trace level, and list CBDA separately if the product is a full-spectrum hemp extract, since acid forms were absorbed 2- to 3-fold better than neutral CBD in canine studies. A dog product without a current COA cannot be dosed by weight, because the concentration is unknown.
This page is general information, not personalized guidance.
General information, not personalized guidance.
Sources
- Pharmacokinetics, Safety, and Clinical Efficacy of Cannabidiol Treatment in Osteoarthritic Dogs Frontiers in Veterinary Science (accessed 2026-10-13)
- Single-Dose Pharmacokinetics and Preliminary Safety Assessment with Use of CBD-Rich Hemp Nutraceutical in Healthy Dogs and Cats Animals (Basel), via PubMed Central (accessed 2026-10-13)
- Preliminary Investigation of the Safety of Escalating Cannabinoid Doses in Healthy Dogs Frontiers in Veterinary Science (accessed 2026-10-13)
- Cannabis, Cannabidiol Oils and Tetrahydrocannabinol: What Do Veterinarians Need to Know? Animals (Basel), via PubMed Central (accessed 2026-10-13)
- FDA Regulation of Cannabis and Cannabis-Derived Products, Including Cannabidiol (CBD) U.S. Food and Drug Administration (accessed 2026-10-13)
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