I squirm every time a client comes in to drop their dog off for boarding and when I ask what they are feeding the dog, they say Ol Roy or Gravy Train or some other cheap food. I know quality food can be costly but it is WORTH the expense!
My parents' rescue pug Chloe has terrible allergies. She gets recurring ear infections several times a year, always itches/licks her paws, gets infections in her wrinkles and has to have her anal glands expressed all the time. They feed Canidae All Life Stages and typically give baby carrots as treats - but I suspect she is allergic to one of the meats or other ingredients in the kibble.
My ex used to feed his pit/Am bulldog mix Bane Kibbles n' Bits. We noticed he had a small lump growing on his leg - the vet told him it would be $700+ to remove it. I convinced him to switch to Canidae and within a few months the lump disappeared and the vet could not understand why... needless to say, I switched vets soon after.
It's funny, I have heard some vets say that feeding some of the big brand foods like Iams is better than feeding an all natural kibble, because "they have been on the market for years and because of such, are safe"... I disagree. Anyone who looks at the ingredient list will see all the crap they add into it.
I saw the link that Marian posted about some sweet potato treats causing dogs to get very sick, similar to the chicken jerky fiasco. From here on out, I am going to be making all my own treats for my dogs. It's easy enough to make homemade chicken and sweet potato jerky. My dogs LOVE carrots, which is another low fat, healthy treat option.