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We also are suffering from some degree of underlying anxiety. Dogs just like people can also suffer form anxiety and obsessive-compulsive disorders. When this happens, there really is no amount of behavior modification that we can do to stop this bad behavior, it is an issue with the central nervous system. We can do if possible plans to have them not be alone as much, have other pets with them, keep them away from stressful events, leave the television or radio on such that they are not feeling so alone. However in the end, we have this underlying anxiety. Then with the legs, the longer we lick and chew at the legs, the more it becomes a ritualistic habit then. This also in time gets harder to treat and address also. I have had a lot of success using a medication called Paroxetine once a day to help with the underlying anxiety and the OCD. It is very inexpensive and very safe for long term usage. After being on it for 1-2 months, we reassess how things are going with the behavior, then we may need to adjust the medication upwards depending on the clinical signs. Your veterinarian can prescribe this medication. They may have another medication that they prefer, however I do feel that with this degree of anxiety, medication will be the best help we can have for the underlying condition.
Then we can use the treatment that I proposed to help treat the skin lesions, however they will probably never totally heal up, at this point many times I have found that they have a tremendous amount of scar tissue and inflammation in them that complicate the complete healing process. However you can use the medications I discussed to help keep the leg lesions healhier and to prevent infection also.
Any other questions I can help you with today on this case?
We can give advice here, however when it comes to prescription medications your attending veterinarian will need to prescribe the medication for you. The skin medications I discussed are over the counter and you can find them in pet stores or online.
With Just Answer you can request the same veterinarian to answer your questions, if you have any follow up questions or need assistance in the future I will be happy to help you work through the case.
You are more than welcome. Best of success and have a wonderful day. Dr Mike