Dog Allergies Treatment

My dog, Winter, scratches all the time. He doesn’t have fleas. I believe he may be getting bit by ants or he may have skin allergies. I hate seeing him like this. And recently it’s getting worse. Unfortunately, the vet can’t see him until next week. Can you answer these questions for me?
What is the proper dog food to by for dogs with itchy skin?
What is the proper shampoo for dogs with itchy skin?
How often should I bathe him?
-I was doing once every two weeks is that too much or too less?
What else should I be doing until his appointment?

we cant find any fleas. could it be an Allergy? what is a good shampoo to help with the itching? she does not have dry skin

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She has allergies but I have her on Benadryl. She’s an indoor dog and on flea medication so I know she’s clean. I had her for 4 years. Vet tells me they have HOT SPOTS but what can I use to relive her itch.? I have tried conditioners, vitamin E, aloe anything to mosturize the spot and I bathe her with special shampoo. Is there anyhing I’m missing?
MP

My dog continually scratches & chews at her back. I have bathed her & given her flea treatments, & I can honestly say that she does not have fleas, yet she continues to scratch herself raw on parts of her body.She is healthy had all of her shots & the vet cannot give me any explanation other than she might have allergies. Can this be the only answer?

i have a shih zhu. the vet said she has flea allergies. ive tried all different kinds of shampoos. they will all kill the fleas but when she goes back outside she has then again, alot of them. and ive tried the frontline and all that that you put on there back. and its works, it kills the fleas but it doesnt keep them away like it says it will. how do i keep the fleas away!!!!!!???? and even when she doesnt have fleas she scratches her self until she has huge sores on her and she bleeds. i feel so bad for her and i dont know what to do to keep her from scratching!!!!