My 8 Month old Aussie keeps vomiting?

A pup that young with no ability to hold food down, is a problem at any rate. it could be anything from a virus that could have been contracted from eating something outside to just a little bit of an upset tummy or reaction to a certain type of dog food. dont get panicky, just keep a close eye on him tonight as best you can and DEFINITELY take him to your vet first thing tomorrow morning. no sense in trying to press food on him but try to get him to drink some water tonight...thoughts of get well soon to your puppy!