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There is no officially established safe dose of CBD for dogs. The FDA has not approved CBD for animal use. A veterinarian should decide whether CBD is appropriate based on the dog's weight, condition, medications, liver health and the product being considered.
Research has found that some healthy dogs tolerated approximately 4 to 5 mg of cannabinoids per kilogram of body weight per day. That does not make 5 mg/kg a universal home dose. The studies used different products, conditions and monitoring protocols.
CBD for Dogs at a Glance
| Question | Evidence-based answer |
|---|---|
| Is there one safe dose for every dog? | No. A standardized veterinary dose has not been established. |
| What doses have appeared in studies? | Approximately 2 mg/kg every 12 hours for osteoarthritis, 4 to 5 mg/kg/day in healthy-dog safety studies, and 9 mg/kg/day as an adjunct in one epilepsy trial. |
| Should owners copy those doses? | No. Study doses are not general prescribing instructions. |
| What is the safest next step? | Ask a veterinarian to approve the product and calculate the dose in milligrams of CBD. |
| What products should be avoided? | Products containing THC, xylitol, chocolate or undisclosed ingredients. |
What CBD Doses Have Dog Studies Tested?
Dog studies have tested roughly 2 to 10 mg/kg in specific circumstances, but they have not established one generally safe dose for home use.
- A six-month study found that 4 mg/kg of CBD once daily was tolerated by healthy dogs. Some dogs developed a temporary increase in alkaline phosphatase, an enzyme associated with liver or bone activity.
- A 36-week study compared 5 mg/kg/day and 10 mg/kg/day. The 5 mg/kg dose was better tolerated, while dogs receiving 10 mg/kg had more soft stools. Both groups had increased alkaline phosphatase, so the researchers recommended liver-function monitoring during long-term use.
- A 90-day study gave healthy beagles 5 mg/kg/day of total cannabinoids in broad-spectrum formulations. The products were well tolerated in those healthy dogs, but the study was not a dosing guide for every dog or CBD product.
- Osteoarthritis studies commonly used 2 mg/kg every 12 hours. One epilepsy study used 9 mg/kg/day alongside conventional antiseizure medication. Both protocols were conducted under research supervision.
These figures describe specific study protocols. They are not instructions for choosing a dose at home.
Why Should a Veterinarian Calculate the Dose?
A veterinarian should calculate the dose because CBD can affect liver enzymes involved in how the body processes medicines. This may create interactions with drugs used for seizures, pain, anxiety and inflammation. Cornell University's College of Veterinary Medicine also reports sedation and increased appetite among commonly observed effects.
A veterinarian may be particularly cautious if a dog:
- Takes phenobarbital, potassium bromide or another antiseizure medicine
- Uses prescription pain or anti-inflammatory medication
- Has liver disease or abnormal liver enzymes
- Is pregnant, breeding, very young or elderly
- Has unexplained vomiting, diarrhea, weakness or neurological signs
The dose should be written as milligrams of CBD, not simply "one treat" or "one dropper." CBD concentration varies between oils, chews and capsules.
The calculation is:
CBD per dose in milligrams = body weight in kilograms × veterinarian-prescribed dose in mg/kg
Do not calculate a dose from the total amount of hemp extract unless the label clearly states how many milligrams of CBD it contains.
How Can You Choose a Safer CBD Product for a Dog?
Choose a product only after a veterinarian has approved it and reviewed its laboratory information. CBD products marketed for pets are not regulated like FDA-approved veterinary medicines. Labels may not accurately show the CBD concentration, and contamination is possible.
In one Cornell-associated analysis of 29 pet CBD products, some contained heavy metals, some contained no measurable cannabinoids, and only a minority were close to their labeled cannabinoid concentration.
If a veterinarian approves CBD, look for a product with:
- A recent certificate of analysis from an independent laboratory
- The exact CBD amount per milliliter, capsule or chew
- Confirmed THC testing
- Testing for heavy metals, pesticides, solvents and microbes
- A batch number and expiration date
- No xylitol, chocolate, alcohol or other ingredients that are toxic to dogs
Avoid human CBD gummies and edibles. Some contain THC, which is toxic to dogs, or xylitol, which can cause life-threatening low blood sugar and liver injury.
What Side Effects Can CBD Cause in Dogs?
Reported effects include sleepiness or lethargy, unsteadiness, vomiting or diarrhea, increased appetite, liver-enzyme changes and drug interactions. Products containing THC or contaminants can cause more serious reactions.
The FDA lists lethargy, depression, heavy drooling, vomiting, agitation, tremors and convulsions as possible signs of an adverse reaction after cannabis exposure.
If a dog accidentally eats CBD, a CBD gummy or another cannabis product, contact a veterinarian or animal poison control promptly. In the United States, the ASPCA Animal Poison Control Center can be reached at 888-426-4435.
Bottom Line
A dose tolerated in a controlled study is not automatically safe for your dog. Have a veterinarian review the product, check for drug interactions and calculate the amount in milligrams of CBD before giving it.