black lab puppy vomiting and lethargic

Question
I fed my 5 month old black lab puppy a chicken sausage in pork casing, and since then, he throws up each time he eats anything, and won't play or anything. he drinks, but no more than usual. i am very worried. have i done something awful or could it just be the heat? its like 90 something and his first summer.  i am very worried and want him to be healthy, but i dont want to blow all my money on a vet just to find out that he is ok.

Answer
He could have bolted down a large piece that is blocking his digestive tract.  Young Labs are very bad about that.  I am afraid you must get him to the vet tomorrow, or Saturday if you vet is open.  Weekend emergencies are outrageously expensive.  Don't put it off.