Is Tuna Good for cats? Or dangerous? And why?

For the most part Boots refuses to eat people food, but the other day a bit of tuna ended up on the floor and he gobbled it up. I had remember something about canned tuna not being good for cats and could not remember why, so thanks for the update.

One other reason to limit feeding tuna to cats is because it makes their poo extra smelly and messy. I figured well it is fish and protein, and maybe lubes them up kind of like humans eating fiber. We generally feed dry indoor cat food to Boots, because he has in the past refused any type of canned cat food.