I have 16 month old DDB. He's been doing well and on Friday I took him for his yearly check up. The vet said she would take him in back and the tech would give him his shots. (I regret letting him go out of my sight, so many things happened without me knowing or being there to speak up.) They gave him Lepto, Rabies and two others which I can't remember without the paperwork in front of me. Usually I space them out so he's not getting them all at once. Over the weekend he wasn't acting like himself. Normally he loves to be outside and is so happy, every time someone took him outside he was jumping at us and trying to nip. Thought he was just restless from a long winter. (Hey it happens to people too.) Yesterday I was at work and I got a call from my dad who is home with him during the day. He said the dog got really crazy running around, ran head first into a wall then ran around some more before collapsing and having what looked like a seizure. They did some basic blood work, blood pressure and monitoring yesterday and he seemed fine. A little less then 24 hours later and he hasn't had another one yet. My vet is suggesting another $400 in testing and putting off his neutering which was scheduled for March 11. I don't know if all the events over the weekend are connected to the seizures or not. Even the vet at the animal hospital we went to said that given how healthy and young he was they weren't ready to say it would be a life long problem. I just don't know if I should put him through the testing if he doesn't have another seizure. I keep wondering if the shots had anything to do with it even though the vet said three days later was too long for it to be the shots. I guess I'm just looking for any advice from fellow mastiff owners.