I don't know yet if it works or if it will help my dog, however when I put it in his food it smells strongly of fish

The best salmon oil there is!!! I have been giving it to my dog for 3 months and her fur has become shiny, glossy, and hardly falls out. Also, her dry and hard paws have become soft like a sponge.
Wonderful product!!!

Very satisfied, it didn't eat dry food and with 2 drops, I no longer have any issues. I gave it for 2 months, now I stopped and it continues to eat its food normally, plus all the positive aspects that salmon oil has. It is American with good reviews abroad, that's why I preferred this specific one

Certainly a quality product, let's start from there.
The reason I give it 3 stars is because I didn't see the improvement I expected. This, of course, is largely related to my dog and his organism, rather than the product itself.
The oil does help with the shiny appearance of the coat and reducing hair loss. My dog naturally has a slightly rough coat, so the softness factor of the coat doesn't do much for him.
Overall, it does keep his skin clean and healthy, but dandruff remains (which is probably due to shedding).
I continue to give it because it has a fairly good effect.
I recommend it and advise keeping it in the refrigerator to preserve it for a longer period (6 to 8 months). It's also good to take breaks in usage for short periods. Personally, I give it for 2 to 3 months in a row, then take a break for 1 month.