Dog Allergies Treatment

My dog has red inflamed ears from what I thought was food allergies but I’m not sure. Well now I noticed he has little sores under his right eye under his hair it almost looks like a rash. You can’t even tell unless you look real close but they are definitely there! Is this still allergies or something more? Lately he has been rubbing his face on the carpet as well as shaking his head because his ears are bothering him. I am taking him to the vet tomorrow morning. I am worried would love to have as many opinions as possible. Thanks so much!!!!
FYI he does not have any fleas and I switched him from Iams Puppy to Wellness Adult hopefully this will help but I have a feeling he is going to need regular medication

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Both of my pugs have had a really bad diarrhea bug, they don’t have worms or anything like that, they are on monthly preventatives for fleas,ticks,worms,etc….and one of them is not over it yet, I’m afraid he will get dehydrated, even though he is still drinking his water. I have read that it is okay to give dogs Pedialyte, but pugs have quite a few food allergies. Does anyone know if they can tolerate Pedialyte, if so…how much do I give them, what kind works best?

I have a 4 month old Maremma X Blue Heeler and have been trying to get to the bottom of her itchy skin problem. She has been treated for fleas and does not have them. We are very dilligent with treatment. I am thinking now that she most likely has a food allergy.
the skin on her belly is very pink and quite warm. She sometimes gets very frustrated and whimpers while she scratches.
She is on pro-plan puppy dry food for large breeds and gets those logs of dog meat from the fridge section at the supermarket.
Does anyone know of any ways I can test my puppy for allergies without taking her back to the vet? He just gave her antihistamines and said I had to figure out what the possible source is…
Any ideas? I’m after knowledgable sources such as vets, vet nurses or breeders. Thank you.

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?

My dog was treated for fleas two weeks ago at the vet. For the past 3-4 days she has been scratching profusely and has caused some sores. She was not scratching like this before the treatment. On Sat I noticed she had a sore on her tail that was bleeding a little and she kept gnawing at it and biting it. I called an emergency vet line and they told me to give her benedryl and neosporin. None of it worked. Does anyone know how much an allergy shot would be on average at a vet?