he ate a little bit today and seemed like he was doing fine. about an hour ago he started shaking and drooling a little so we got him to drink thinking he was dehydrated. he threw it all up (big mess) hes still shaking but it doesn't seem as bad. hes half st bernard the other half is yellow lab and german shepard. we called the vet and he said he should be okay but im such a mom and still worried. has anyone dealt with this before, what should i do?

If he is shaking, then I would take him to the Vet because he may have a high temperature.

i wouldn't wait, just take him to the vet and get him checked over. If nothing else it will stop you worrying.

definately get a vet check if he is shaking, better to be safe than sorry

I agree.  He needs a vet.  NOW!!

Agree with everyone else, see a vet immediately .