M.B.
Hi L. :)
They put a lot of stuff in pet food than can cause allergic reaction in animals, ranging from skin problems, tummy and bladder problems, low energy, weight gain, strong odor etc. The list goes on and on. Hills advertises as being healthy but it's far from it.
I've fostered and owned a lot of dogs and cats over the years and each time, they come into my house with some sort of health issue. I always switch them to a better diet and I see results almost emmediately. Their coats are glossy, their skin problems disappear, they loose excess weight, their energy increases, tummy problems clear up and miraculously FLEAS don't even stay on my pets. I havn't used flea meds in years :)
My favorite brand for dogs can be purchased at petco and petsmart. It's called Nature's Recipe Farm stand http://www.naturesrecipe.com/recipe_detail.aspx?id=454
Whichever brand you choose, you want it to be free of these ingredients: Corn, wheat, soy, preservatives, additives, artificial colors, by-products. Also note--that lamb is great but can cause your dog's odor to increase.
Best of luck! :)