What else can make a dog itch with rash all over besides food allergies?

Poor thing! My German Shepherd has food allergies, and of all things she's allergic to fish! You might change out the fish oil and use flax seed instead. It doesn't have as much of the fatty acids that fish oil does, but if your dog is having an allergic reaction to the fish, that may be your only option.

Another thing to consider is that it's spring, and grass and pollen allergies occur in dogs. Has he been rolling around on the grass lately?

You should really get him an Elizabethan collar. They sell them at the stores and the vet's. Make sure you get one that either snaps closed, or has interlocking tabs. Otherwise, his constant itching won't allow his sores to heal, and they could become infected. Clean them with peroxide and slather them with neosporin. He'll probably end up wiping most of it off, but at the least it should help keep the wounds clean.

I'd completely stop the sprays and baths and such. Quite often, overdoing those will only worsen skin irritations. They're loaded with chemicals. Not good for a sensitive canine!

Since you don't know exactly what he's allergic to, I'd recommend putting him on a bland diet of chicken and brown rice (unless you know for sure that he's allergic to either of those ingredients). It's called the elimination diet, where you start with the basics and slowly add new things to see if it causes a reaction. It can take several weeks, but it would help his body rid itself of all the allergens that his body is fighting right now, making him miserable.

Also, restrict his outdoor time to potty time only, so he doesn't have a chance to get anything on his coat and skin that could make him itchy. Wash all his bedding with hypoallergenic detergent. Sweep and mop tile floors with hot water and bleach.

There are other conditions besides allergies that can cause your dog to have an itchy rash. You should bring him to the vet and perhaps he/she can prescribe a low dose short-term steroid for him. I know steroid is a scary word but they really can help in a case such as this. They will relieve the immune system allowing your dog to get some comfort. It is only a "band-aid" though and you should have more testing done to find out what the problem is. He might even require an antibiotic at this point if he has open sores or raw spots. I hope this helps.

Hot Spots, Mange, Scabies, Fleas, Mites, poor diet, allergies. I would contact your vet and use more care about what foods he has access to.

Your dog's continuous itching and scratching will probably be your first clue that he's got fleas. If you look closely, you may actually see the little dark brown bugs. More likely, though, you'll see what look like black and white specks. The black specks are "flea dirt," or flea feces. The white specks are flea eggs. If you do see actual fleas, they won't be easy to catch because they move fast and can jump farther than you'd think their tiny legs could take them.

http://dogtime.com/flea-control.html

Flea allergies, mold, house dust or house dust mites, and the pollen from trees, grasses, and weeds.

you should really go to the vet or to the libary they usually have good vet books on these things

aww the poor thing! take it to the vets asap :|

just about anything has to be tested.