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Unfortunately, there are many conditions that can cause a dog to experience hair loss including ringworm, mange, hypothyroidism, cushing disease and allergies. Ringworm can have a scaly reddish rash around the edges of the bare patches though there can be a rash in the bare area as well. Any over the counter antifungal cream for ringworm will work on this. The cream should be applied to an area slightly larger and for about a week after it appears to have cleared up. There are two types of mange and mange is actually caused by mites. Usually hair loss starts in specific areas of the body before spreading to other areas. Allergies are a frequent cause of scratching and hair loss and an be caused by many different things. Treating any problem without knowing for sure what it is causes a delay in the treatment of the real problem if your first guess is wrong. Since you have had your dog to the vet and he prescribed an antibiotic and anti-inflammatory medication, we can probably rule out ringworm as it is pretty easily diagnosed. In addition, mange is usually diagnosed with a skin scraping. If one was done, the vet would likely have mentioned mites to you if they were present. They still might be the problem as demodectic mange mites are not always found in the skin scraping. Below are websites that will go into more detail on these conditions.
Here is a website on Ringworm for information purposes.:
Here is two on Mange.
Hypothyroidism and cushing on these pages:
You can read up on allergies here:
If you suspect an allergy condition is to blame, you can give your dog Benadryl up to 2mg per pound every 8 hours. I suspect that this is related to an underlying allergy. The fact that it has started recently and that treatment is not having the desired effect. If the dog is still exposed to the allergen, treatment won't be that effective.
There might be a secondary skin condition in addition to the allergy such as staph dermatitis or yeast dermatitis. Staph usually occurs on the lower regions of your pet and tends to have small pimple type bumps. Shampoo containing Chlorhexiderm and/or Oatmeal can help with this condition though it does not cure the allergy. Yeast typically shows as a greasy area that has a sweet musty odor. Sometimes the skin can become inflamed, darker and thickened due to itching. Yeast likes areas such as between toes, armpits and ears. Selsun Blue Shampoo can help with Yeast dermatitis. When shampooing, lather and leave on 15 minutes before rinsing. These shampoos are not meant to be a cure, just a relief until the medications start helping cure the problem.
There is also a condition called alopecia which is basically hair loss. You can read all about it in this article:
Some treatment methods for this are discussed on the following site. You might want to discuss this possibility with your vet.
I would continue medication to ensure the secondary infections are cleared up, but I'd also try to determine the cause of the allergy. I'd look for something that you possibly fed the dog starting right before you saw any changes in your dog. The changes might have been additional scratching or even loose bowels and upset stomach which all can occur with an allergic reaction. Rashes are often present but with all the hair might not be noticeable.
The allergic reaction cause scratching or rashes and then the skin's immune system is compromised and the secondary infection occurs and causes itchiness which in turn damages the skin and leads to hair loss as well creating a vicious cycle. Both the skin dermatitis and the allergy symptoms have to be treated at the same time. Even once you discover the allergen and stop feeding or remove it from the dog's environment, it still can take siz weeks or longer to see improvement. Allergy testing can speed things along as you identify the allergen and not have to rely on memory to determine what changes occurred like new treats, people food, change in ingredients in his normal food, even cleaning supplies or laundry detergent if the dog is exposed to bedding, clothing, etc.
Fleas can also set off a reaction especially in front of the tail on the back. This is usually a moist type of dermatitis. If your dog is on a good flea preventative, this is less likely to be the cause. If fleas might be the issue, let me know and I'll give you some treatment methods that might help get his skin cleared up and the fleas under control.
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