Just because the breeder's other litters didn't show signs of allergies doesn't mean yours won't have an allergy to the corn. Dogs like people are individuals and allergies aren't necessarily genetically passed along. But as someone mentioned, a lot of allergies are environmental. But it is important to "test" to find out - make detailed notes on when the hot spots become most irritating; is it right after the dog has been outside after a rain where soil molds become an issue; are there certain blankets or crate pads that cause an issue; and don't forget to run a food test eliminating corn, as it might not be the corn but some other ingredient.
