I think I'd cross off the Blue Buffalo. First, don't use their Blue Wilderness Salmon, as it contain chicken. Thats a little trick manufacturers sometimes use- label a food as "fish" and then sneak chicken in further down the list.
The other Blue formulas I don't like because they don't contain much fish. They do have fish as the first ingredients, but it is WHOLE fish. Ingredients are listed by weight, and when it says "fish" or "chicken" it means whole meat. Which is theoretically good. BUT, kibble is a dry product. And whole meats are about 70% water in weight, which is cooked off in the process. The next few ingredients on the Blue lists are all heavy grains or starches. Once you add all the non-meat 2nd, 3rd, and 4th ingredients together, and account for the loss of the water weight in cooking of the meat, these foods are really mostly grains/starch.
What you want to see is MEAL- ie "Salmon meal" or "chicken meal" (named is best- byproduct meal and "poultry meal" or "meat and bone meal" are low quality) What meal means is that the meat has had most of its water weight removed. Think, sort of like jerky. So a food that has fish meal really has more fish meat in it.
10 pounds of fish meal= 10 pounds of fish meat
10 pounds of Fish = 3 Pounds of fish meat, 7 pounds of water
See how the food with meal actually contains more meat?
I like both the Nature's Domain and the the TOTW. I like TOTW a bit more because I think it contains more meat. Its protein and fat counts are slightly higher than Nature's Domain. In TOTW the first two ingredients are meat (the first is Salmon inclusive of water, but thats ok because it is directly followed by a meal) and of the first 7 ingredients, 4 are meat, and one is oil.
Nature's Domain, the first ingredient is salmon meal, but you have to go to ingredient #10 until you find another meat ingredient. It also does a lot of "splitting" which is listing a non-meat ingredient in several forms, all in the first 7 ingredients (potato, potato fiber, potato protein)
I think they are all good foods, and better than your previous food. But I would choose TOTW as the best quality of the 3.
-Neb
