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Good Morning and welcome! I am Dr. Loretta, a licensed veterinarian and I am happy to answer your question.
I am so sorry to hear about your sweet Mr. M's condition...this is very common and you have done everything possible to stop this behavior. It appears to me that Mr. M needs more help and your vet can prescribe medication such as Fluoxetine or Clomicalm to help Mr. M adjust to this new environment. Cats have a very difficult time adjusting to a new baby and in most cases, the Feliway and other aids will get him past this. Since your Mr. M is still having trouble, talk to your vet about adding this medication...it will only have to be used for 1-2 months and will be worth it in the long run.
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