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?

This cat is allergic to fleas, so we make sure to keep that problem resolved. We have taken her to the vet and she has no fleas (he did give her an allergy shot to be sure), she does not have mites, neither does she have infection. He did an allergy test on her and found nothing other than the allergy to fleas. Even though she was only scratching her ear, I had the vet check everything from mites to worms, just to be on the safe side.
In the past, once I saw her scratch even once, I would use her flea med immediately and the problem would be solved. I rescue animals so sometimes one will bring a flea in, even though I quarantine the new ones, stuff happens sometimes. And I stay prepared. I also have the exterminator come every three months … an ounce of prevention.
She began scratching about three weeks ago and I began the ritual. However, when I checked, I saw no sign of fleas. Now I do know when a cat or dog is allergic, one can wreak havoc – and there is never just one.
When she did not stop scratching after the first day, I loaded up the kitty carrier and took her to the vet. I have done this three times and he has not found anything. She has scratched until the spot just behind her ear is raw, and it looks terrible. I have a natural medication I use on it and that is about the only thing that helps. I have tried all of the medications and they make her ear burn, cause her obvious pain and do little to even help the raw area. My problem is, even after I put the natural concoction on that helps, she will wait a day and then begin scratching again. Thus, about time it scabs over and looks like it might heal, she breaks it open again. I just put the medication on her rear again this morning and she actually purred while i was putting it on, and then began rubbing against my legs as cats will do when they are happy. I sat and held her for awhile so she would not try and rub the salve I made off, and the little booger actually took her paws and wrapped around my neck as if she were hugging me.
I am just totally stumped! I have never seen any animal keep scratching as she does, even when I know it is hurting her. I am worried she is going to permanently damage herself.
Any thoughts, ideas, or suggestions?
Add: We have tried the basic anti-itch medications as well.

fleas in it but i am kinda scared about bombing the aparment. Will the fleas continue to live even though they will not be able to live on my dog b/c of the frontline? Its september and starting to get cold so that may factor in on the fleas thriving in a colder enviroment. Is there any safer affective way to treat my apartment? I dont want to bomb since i live in a apartment and is not totally safe AND one of my dogs has skin allergies. I want stop these lil pest from biting me and i want them out of me and my animals lives!!!!

She is currently on frontline and sentinel, so I don’t think it is fleas, can it be an allergy or other mite? Or what?

I took my border collie to the vet because she has a really intense itch on her back and tail. The vet said it is flea allergies, so she gave the dog a pill to get rid of the fleas in 24 hours and some topical Advantage Multi. She is still itching like crazy. How soon will the flea bites (assuming the fleas are gone) stop bothering her?