Can anyone help me out, my Cav has terrible seizures, has anyone else experienced this? It seems to only happen when we are out for a walk, he goes totally stiff and shakes, it is terrifying to see. I had him at the dog hospital and they thought it was epilepsy, they done tests and it turns out its not. My vet thinks he is not getting enought oxygen to his brain. I am now afraid to bring him for walks in case it happens again, as you can imagine I really fuss over him and he is spoiled rotten!!!!!!