I feel you should get a different vet to look at your dog. Is this one a man or woman? Whichever it is get the opposite sex for starters. Call around and ask when you call if they are willing to handle a hard to handle dog. Some vets are more willing to do this than others. Read this link about the Melatonin as it is OTC and it may very well help to calm him some. I feel he may have a serious problem- like possibly cancer-and needs to be seen so you'll know what to expect in the near future if it is. I also would hate for it to be something simple that may be easily cured nd you be expecting the worse. Here is the link- I use it in my dogs for thunder phobia.