I have an 8 year old Chocolate female. I took her to the vet for a heart worm test, rabies shot and distemper(?) shot. Her appetite and everything else about her was fine before the vet visit. Now, four days later she has hardly eaten a thing and is looking bad in my opinion. Could this just be a reaction to the shots? I want to give her a couple of days if I can just to be sure it's not just a reaction from the vaccines.