Why not? I give my dogs 1 fish oil capsule a day, maybe it helps.

Every time you open your dog’s bottle of fish oil, something bad happens …
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These Essential Fatty Acids (EFAs) are critical for his skin's oil glands. They improve his overall health and immune response. Benecoat® is a blend of fish and krill oil for dogs with these essential fatty acids.
We know that it’s beneficial to humans, but what about fish oil for dogs?
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You’ll be happy to know that quality fish oil is not dangerous for canines when reasonably dosed. The good news doesn’t stop there since several studies have proven this super supplement can also be beneficial to dogs. Some dogs given fish oil may develop ‘fishy’ breath, oily hair or yellow skin flakes.
Photo provided by Flickrof How to Use Fish Oil for Dogs was reviewed by  on January 13, 2016.
Photo provided by FlickrLiquid fish oil products made for humans often contain flavorings that dogs generally do not like.
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Q: Can I feed my dog the same fish oil that I am taking?
A: For small dogs less than 10 lbs you may find regular strength human fishoil capsules work well as these tend to have just under 200 mg EPA per dose. Be sure to read label carefully to find out if per dose amount takes two capsules or just one. For bigger dogs, particularly dogs over 50 lbs, you will need extra strength capsules unless you want to be feeding 10 or more pills per day. For high dose supplements, you will find various options under "extra strength fish oil". Liquid is good if your dog won't eat capsules. Some dogs will eat the human fish oil liquid despite the lemony flavor.If you make your dog’s food yourself, there are several factors to consider with regards to whether you should provide fish oil supplement as well as include .I know that sounds crazy … millions of dog owners feed their dogs fish oil every day. And there’s good reason to add fish oil to our dog’s bowl every day – he needs the omega-3 fats it contains.Most commercially available fish oil supplements for dogs are derived from cold-water fish, primarily menhaden, but also sardines, herring, salmon and trout. Marine oils are good sources of EPA and DHA.So the whole point of feeding fish oil is to reduce your dog’s risk of disease or disease symptoms, right? You don’t give your dog fish oil to add omega-3 fatty acids or DHA or EPA to his diet … you do it because you love your dog and you want to make him healthier, free from diseases caused by chronic inflammation and, hopefully, make him live longer.Both omega-3 and omega-6 fatty acids are essential in the diet of dogs and cats due to an inability to produce these fatty acids from others consumed in the diet. The essential omega-6 fatty acids are linoleic acid (dogs and cats) and arachidonic acid (cats only). The essential omega-3 fatty acids are alpha-linolenic acid, EPA, and DHA. Animals in different life stages have different requirements for these fatty acids. For example, a reproducing cat requires more arachidonic acid than a spayed or neutered cat, and a developing animal requires more DHA than an older animal. This is due to the different roles played by the fatty acids. Linoleic acid and alpha-linoleic acid are only found in plant-based oils such as corn oil, canola oil, or soybean oil. Arachidonic acid is found in the greatest concentration in animal fats, while EPA and DHA are found in the highest concentrations in fish oil.