Much to my dismay, my breeder had my Bernese puppy on Purina Puppy Chow. Right when I got him we began weening him onto Natural balance by doing a 3:1 ratio of Purina to NB, then half and half. Since the day we got him his eyes had been very red – to the point where I was concerned about him developing cherry eye – and he was a very itchy boy. He was given a flea treatment just before we got him, so for the first few days we attributed the itching to that.
I abruptly switched him to all Natural Balance a few days ago and gave him a hypoallergenic oatmeal shampoo bath. His eyes haven’t been red since and his itching has slightly subdued.
How long does it typically take for all food-related allergy symptoms to clear up?

I have 2 dogs & both of them have red eyes, licked raw paws & under bellies! I have tried all the food elimination possibilities, I’ve tried expensive food cheap food, I’ve cooked food & no relief! I don’t want to do the steroids from the vet because of liver & kidney damage & it only works for a week or so at a time! I think they are allergic to the grass in our yard & possibly the carpeting in our house! Help! can I give them the allergy meds I take!

My moms great dane has had loose stools recently, has always had a ton of eye “buggers” and red ears (not ear infections but very red and raw looking). I have been telling her to try switching from kibbles n bits to a better quality food and today she switched to Canidae ALS. I know that if these things were food related they would not immediatly correct themselves but what is a reasonable amount of time that if they were food related they should correct themselves?
I personally noticed a reduction in the eye buggers when I changed food last year but is this something food related or could I have just changed when the seasons changed?
Thank you.