My sheltie has had a couple of strange turns (4 to 6 months apart). All of a sudden his back legs will stiffen and he acts like there is no feeling in them , he can't stand. He gets very nervous and drools a lot for about an hour. During that time all four of his legs stiffen about four times. I had a Scottie years ago and when she had seizures she paddled and was out of it , this didn't seem like a seizure. Does anyone have and ideas???I took him to the vet and she recommended 100mgs zonisamide. That seemed to be a lot of medication and it is the weekend and I can't ask the vet. Any help will be appreciated.

