One of my civvies (George) had a couple of seizures. He was an elderly can't and while it freaked me out, the vet wasn't overly concerned. You may want to ask the vet if they checked Yum's electrolytes. I'd also ask if this could be a side effect from the Convenia. Reading through all the posts, my thoughts were the same as Stacy's -- it could be a kidney or or urinary track infection. You'r vet needs to do some continuing ed on the subject! I'm glad they have it diagnosed. I'm also glad you got Yum started on S. Boulardi.