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Fish Oil Dosing Chart

Please note: This information is provided for use by veterinarians. If you have a question about your own pet, please contact your regular veterinarian. If your pet is a CSU Orthopedic Medicine and Mobility patient and you have questions, you’re welcome to email us at Please understand that our doctors cannot give advice for you and your pet without having seen your pet recently.

Below is the maximum daily dosage for animals with osteoarthritis (310 mg/kg0.75 of EPA/DHA per day) as suggested by Dr. Bauer (J Am Vet Med Assoc. 2011 Dec 1;239(11)). While fish oil is generally benign and safe, certain side effects beyond weight gain and vomiting/diarrhea are possible; therefore, pet owners should contact their veterinarians if their animal has health issues other than osteoarthritis, or if there are any other questions or concerns. Particularly, if your pet is suffering from osteoarthritis and obesity, giving fish oil might not be ideal.

Please note that the maximum dose (outlined below) is not tolerated by all animals, and a lower dose may be preferable. We generally start with approximately a quarter of the maximum dose and then increase the dose slowly while monitoring for any side effects (such as loose stools and vomiting).

The dosages outlined below represent the combined dose of EPA and DHA. Quality products will display these amounts on the label. Realize that there are many different types (type of fish, etc.), formulations (pump dispensers, capsules, etc.) and qualities of fish oil available. Some independent companies offer quality control for human products; however, many products are not tested. A convenient way of providing fish oil is to purchase a high-quality joint diet (pet owners can get more information on diets from their veterinarians). Also be aware that other ingredients included with certain fish oil formulations may be harmful for pets. We therefore recommend a veterinary consult prior to giving any fish oil products to your pet.

Some non-veterinary formulated supplements may not be appropriate for your pet; they can even be harmful! Please consult your veterinarian whenever using supplements.

The dosing provided below is based on kg metabolic body weight (MBW, which = kg body weight0.75) of EPA and DHA combined (and not for just “fish oil” or “omega 3”). 

Dog Weight (lbs.) ​Dog Weight (kg.) ​Recommended Dose (mg) of Combined EPA/DHA for Osteoarthritis
​5 ​2.3 ​574
​10 ​4.5 ​965
​15 ​6.8 ​1308
​20 ​9.1 ​1623
​25 ​11.4 ​1919
30​ ​13.6 ​2200
​35 ​15.9 ​2469
​40 ​18.2 ​2730
​45 ​20.5 ​2982
​50 ​22.7 ​3227
55​ ​25 ​3466
60 ​27.3 ​3700
​65 ​29.5 ​3929
​70 ​31.8 ​4153
​75 ​34.1 ​4374
​80 ​36.4 ​4591
​85 ​38.6 ​4804
​90 ​40.9 ​5014
​95 ​43.2 ​5222
​100 ​45.5 ​5427
​105 ​47.7 5629​
​110 ​50.0 ​5829
​115 ​52.3 ​6027
​120 ​54.5 ​6222
125​ ​56.8 6415
​130 ​59.1 ​6607
​135 ​61.4 ​6797
140 ​63.6 ​6985
​145 ​65.9 ​7171
​150 ​68.2 ​7356


Veterinarians: questions and concerns regarding fish oil dosing should be directed to the Orthopedic Medicine and Mobility staff.

Pet owners: please consult with your regular veterinarian.


Phone: (970) 297-5000​​

Contact Us:
Colorado State University
Veterinary Teaching Hospital
300 West Drake Road
Fort Collins, Colorado, 80523​​

(970) 297-5000

(970) 297-1205