I have a 7month old English Shepherd lab mix, and after he drinks a lot of water and eats, he throws up the water and some of his dog food. Then precedes to eat it. (I do stop him) Also, its been in the 90's-100's, so could this be the cause as well? So is he just overeating, over drinking, over heating, all three, or something serious?:confused:

He might have worms.

Take your little guy to the vet.

Sounds like heat stroke.

Keep him cool, put a fan on him and maybe some wet towels.
Rub his tummy with the wet towels every so often and the bottom of his paws when he lays down.

If his condition doesn't improve after that you need to get him to the vet.