Hahaha...thank
s, Jenn!
Yeah, too much fish can be bad, because of toxins that bioaccumulate. However, that isn't too much of a problem with the smaller fish, like the anchovies and sardines. And, farm raised salmon is worse than wild-caught salmon. (Kind of counter-intuitive)
That said, because a dog's life-span is a lot shorter than humans, you don't really have to worry about the toxins as much for them as for you. The EPA usually gives the age of 70 for a human to develop cancer. Um, that's weird, I know...but, its a guideline. By that they mean that most people will develop some kind of cancer by age 70. Dogs don't live that long, so the toxins are not really as big of a deal.
Anyway, you didn't necessarily ask for toxicology advice. So, I will just whole-heartedly agree to the food allergies, supplements (Omega 3 and 6 in balance) and check out the hypothyroidism
.