Welcome to Yorkie Talk,
I am so sorry your little one had a seizure and I know all about the vet bills associated with them

, My Gracie who will be 2 in May had this problem when she was 12 weeks old. These little guys can really hurt the wallet if problems arise and require ALOT of attention. My little Gracie is my best friend and I am there for her for whatever is required (and even when i'ts not

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It does sound promising that they allowed your baby to come home with you after being stabilized. Gracie was required to stay at the emergency vet overnight for further observation and IV meds(valium, etc), and then back to my vet the next day (to defer some of the cost). She had a bile acid test to rule out liver shunt and then went back to the emergency vet the next day for a CT scan of head and abdomin. They finally concluded she must have ingested something that cause the seizure. We had been battling ants and used a liquid product that you place on little pieces of cardboard(it's sweet and attracts the ants). We feel that maybe a piece of cardboard may have fallen off the counter and she licked it up. This is only speculation. She was at that time gated off in one room only with NOTHING remotely toxic in the room, but was allowed in the kitchen when we were in there. Who knows??? I was so glad it was not a liver shunt, and that no brain issue was present. She was on anticonvulsant liquid medication for a while and has NEVER had a seiqure since that horrible day in August, 2004.
My prayers are with you and hopefully all of this will resolve itself and your baby will be fine. Please keep us updated.
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Gracie, Boodah and Dianne