One of my toy poodles had seizures and I suspected it was from the shots she got every year, started about 6-10 yr.s old, vet didn't think shots would cause them, her face would swell up also, they tried benadryl, pills and shots, not giving all shots at same time, nothing worked I insisted that she not get the shots and WALLA WALLA, no more seizures, she only had a few a year. She would go down and lay like a frog, stiff only lasted a short time, would try to get up but, couldn't, had them some outside. We had to watch her in hot & cold weather, she wasn't out in it too long. She is now 15 1/2 Yr.s old, just normal aging problems now.