Hi there and thank you for your question. My name is ***** ***** I am a licensed, internship-trained veterinarian with 10 years experience in general medicine and emergency and critical care medicine and I would be happy to assist you. Please be patient as there may be slight delays in responses as I research your pet's issue.
I am so sorry to hear about the loss of your beloved dog. When it comes to animals grieving, it can take up to a year or longer before they return to normal. It can help to buy him a DAP collar... it is a collar that diffuses pheromones that can calm and soothe dogs. You can buy them online or at pet stores:
This can help during the time of transition. If it does not help, you can talk to your veterinarian about trying him on generic Prozac, which is inexpensive and can help. In the meantime, here is a pet loss grief hotline link put on by Cornell Vet School to help you with your loss:
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