My puppie got a concussion

Question
Hi. I have a  9 week chihuahua. Earlier today u think he got a concussion im not sure if it was that. he started twitching and posturing.After that happened all he's been doing is,sleeping he doesn't come when we call him. He hides. Is there anything I should be concerned about? Is there something I should do?

Answer
Eve,
It sounds more like he got a convulsion.  Get him to the vet so they can see why he had that, it could be anything from eating a mushroom to a brain problem, but you need to know so he can be treated.   Eating mushrooms can cause death and so can a sever convulsion.  
nancy