This is the most common cause of dog itching and scratching. They usually develop after a couple of years of exposure, if they're going to develop at all. No one really understands why one individual will develop allergies, while the next one won't. Genetics are thought to play a part, since allergies often run in families. Repeated exposure is important, too. Other scientists theorize that it may have something to do with immunizations given at an early age, or with lack of exposure to certain diseases at an early age. We're learning a lot about the immune system, but there's a whole lot more to explore.
I have a 130 pound Blood Hound that had the same symptoms. I took him to the vet and paid dearly for antibiotics and steroids. Yep, it cleared up. The steroids mask the symptoms. The problem was back after the steroids ended. After reading for days, I found that some people use yogurt for pets with yeast issues. I feed my dog 4 tablespoons in his food every day or every other day. He has no issues now. Only use the plain yogurt and it’s a cheap cure. The dog loves it. Adjust the yogurt to your pet’s size and see how they tolerate it. It worked for me.
Anabolic steroids increase the production of red blood cells, which increases the amount of circulating oxygen and promotes tissue growth. Testosterone, made by the testes, is a naturally-occurring anabolic steroid. Synthetic anabolic steroids are similar to testosterone, but they don’t have as many masculinizing effects. Anabolic steroids are used to treat chronic, non-regenerative anemia in pets. They also are used to increase muscle mass, improve body weight and condition in older dogs and restore weight and body condition in animals after surgery or debilitating disease.