[Help] Dog had flea control and heartworm prevention medicine today and vomited hours later

My dog is a Pomeranian mix and around 8 lbs. I gave him his medication today that we received from the Vet yesterday around 1-2pm. He threw up everything in his stomach around 7:15-7:30pm. He is very sensitive to many foods and I'm guessing he ate a little bit of my grandmothers dog food when we went over. Do you think the medicine had enough time to digest?I am going to call my vet tomorrow to ask her opinion, but I'm looking for a quick answer for now. via /r/dogs http://ift.tt/2rraMUR