Ok great thanks.
The reason I asked about flea control is that the fleas favorite place to bite is over the lower back.
The kind of fleas, that go on dogs, feed and then jump off.
So, people always think that fleas are not the cause because they do not catch a flea on the dog.
If he is allergic to flea saliva, one flea bite will cause him to have an allergic reaction.
So, to start I would apply a good flea preventative such as "frontline" or "advantage" drops. Both are over the counter and you can buy them at pet stores or online.
You can give him human Benadryl for itching. The dose is 1 mg of Benadryl, per pound of dog, every 12 hours.
In addition, you can apply over the counter hydrocortisone cream, or spray, to the affected area every few hours until the inflammation, and itching, have resolved.
If it is not flea saliva allergy, then it could be environmental allergies or food allergies. Beef, chicken, lamb, corn, wheat, and soy are the most common food allergens. Food allergies develop over months to years.
To determine if he has food allergies, he would need to be put on a
completely hypo-allergenic diet for 6 weeks. The name of the
hypo-allergenic diet is "hills z/d." It is a prescription diet and you
have to get it from a veterinarian. There are no over the counter
completely hypo-allergenic diets. It is only about $10-$15 more a month
so it is not that bad if it fixes the skin issue. If his skin improves, then you know it is food allergies.
He could also have environmental allergies. This is called "atopy" or "atopic dermatitis."
The dog's skin comes in contact with the allergens and then they are
absorbed into the skin causing an allergic reaction. Your vet can do a
blood allergy test to see what he is allergic to. Then he could
receive allergy shots to desensitize him to the allergens. The allergy
shots are 50-75% effective. We also treat atopy symptomatically with
antihistamines, shampoos, topical creams and sprays, cortisone, and
immune suppressing medications.
You had asked about a good shampoo. epi-soothe shampoo is good
This is a great leave in conditioner for itching resicort
I hope this helps.
If you have additional questions, please reply again.