I don't want to sound suspicious either, but did the groomer come highly recommended because I have heard horror stories about them drugging the dogs to make them easier to groom. I have been advised to stay with your dog when he is being groomed. Better yet, go to a groomer that does it out of her home where you can stay. Yorkies are the most "stolen" dog of all the breeds. I use a mobile groomer that comes to my house becuase I have so may dogs and a cat.
It could have been an allergic reaction too but your description if his behavior sounded like he may have been drugged. |