check with your vet. I know there is a collar on the market which releases natural pheromones which act to reduce stress. The vet I worked for often recommended to to clinics with dogs like yours. Clients reported back that the collar did work. The collar itself is activated by an increase in body temperature. I can't remember the name of the collar, sorry. I will, however, try to remember to ask tomorrow when I swing by the clinic to pick up some stuff.