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My name is***** and I would like to assist with your question today. Is the tail the only region that is being chewed at?
And aside from using the training collar to discipline, have any medications been tried? Such as flea prevention or a steroid like prednisone?
Although OCD does happen, it is more common to have an underlying problem that causes itching, the dog chews at the area, creates and infection and makes the problem worse. It is like a cycle effect.
A medical problem with the skin needs to be excluded before a diagnosis of OCD can be done.
I typically put dogs that are doing this on a course of prednisone and an antibiotic for the skin to clear up any secondary infection created by the chewing as well as a flea treatment. This needs to be continued until the area is healthy again. If the chewing continues after 2 weeks of treatment, then that helps narrow down the causes of the chewing.
Testing on the skin can also be done to rule out that there isn't a mite living under the surface of the skin that cannot be seen without a microscope (demodex).
Has any of that been done in the past?
Is it a veterinary product or an over the counter flea medication? Many of the OTC ones do not work. The tip of the tail is a very difficult area to heal. Dogs are drawn to the area when it has an injury but the area needs to be protected so it can heal. Oral medication are needed, as well as a cone collar or a wrap that is changed every day to facilitate healing.
Sometimes this injury will not heal and the tip needs to be amputated to close the skin surgically.
Yes, that is a very difficult area to heal. Do you use a cone collar?
I really feel it is needed to keep the area protected. Until it is healed, your dog cannot have access to chewing on it. I also make wraps using harder plastic so the dog cannot chew through the wrap.
I use either a syringe case or pill vial with holes cut in it for the extra protection.
I was trying to find a video or photo of this but I'm having trouble locating one.