A bath once every two weeks is too much. They should be bathed once a month.. others will argue that they should be bathed every 6-8wks. Every time you wash your dog, you are washing away the natural oils on the skin that protects it from the outside world.
What kind of shampoo are you using? Anything HARTZ brand is pretty bad for your dog.. Try bathing in a good quality oatmeal shampoo. You can either speak with a groomer or speak with your vet on what type of oatmeal shampoo you should use.
How old is your dog? Mange really doesn't effect a specific age group, but it is more common in younger puppies.
Food allergies will cause a dog to itch the hair off. Even though Blue Buffalo is a good brand, your dog still may be allergic to one of the ingredients in the food. You could try and so some self diagnostics and change to an hypoallergenic food with one of the more higher quality brands.. just know that food allergies take a long time.. 6wks or more.. and during this trial period, the dog cannot have anything outside of the dog food.
Environmental allergies could be another reason he is itching himself hairless. Even though its winter, that doesn't mean that there aren't seasonal allergies.. especially if you live in a warmer climate. I know here in Colorado, the dog and I are both itchy.
You can try over the counter medicines such as Benedryl. Its 1mg per 1lb of body weight.. Benedryl typically comes in 25mg tablets.. so if your dog weighs 50lbs, he'd get two tablets 2-3 times a day. With the Benedryl, you want to be certain that there are no decongestants in it, just Diphenhydramine. If the Benedryl doesn't seem to do anything, than its time to go to the vet.
To protect his body from self mutilation due to his itchies, put him in a big shirt.
You can also start feeding a fish oil supplement to help his skin maintain some type of healthy condition. Speak with your vet on the proper dosage for your dogs weight.
Skin can be very difficult to treat and diagnose. I hope you are in it for the long run and are prepared for big vet bills. I would almost suggest that whatever your vet prescribes doesn't work, that you head to the pet dermatologist. Nothing against general practice vets, but most vets are not that great in treating skin problems aggressively enough to make a difference.
I hope I helped out by giving you some information. Please keep us informed on what your fur baby is doing :)
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