Yes...look for wild salmon oil capsules. You can buy them at any health food store...they are sold for humans. They are usually in 1,000 mgs capsules. I just bought some at Costco...good price...it's Alaskan Salmon oil and fish oil mixed.
I just throw the capsules right into the food...mine eat them...no squeezing or fussing.
Why do you think your dog needs fish oil? What food are you feeding? I give my older arthritic dog, fish oil capsules all year round (2,000 mgs per day) because it helps with inflammation. I give my younger guy fish oil caps, when the weather is cold and the furnace starts running in the late fall till early spring.
If your dog is eating a good diet, and does not need the fish oil as a supplement for a condition, it really should not need fish oil.
If you give fish oil you also must supplement with vitamin E (400 mg) three times per week.
Gina