Hi Omayra,
This sounds like a very serious problem. I’d recommend that you see a veterinary behaviorist http://www.dacvb.org/about/member-directory/
If you live in a location without a boarded veterinary behaviorist than look here for a veterinarian with special interest in behavior. http://avsabonline.org/resources/find-consult-all/ For some reason the search function isn’t picking up a lot of the people in my area so you may want to scroll through all the listings yourself.
It is of great concern that your dog’s behavior has significantly gotten worsened after the consult. What advice have you been given? Has your pet had a through medical exam including blood work? If this were my dog I’d want to make sure there isn’t a liver shunt considering the breed mix/age group.
If medical causes are ruled out the veterinarian may discuss early intervention with drugs if appropriate.
Good Luck
