This morning my dog (5 year old lab) has been his usual happy self when I fed him, but about 5 minutes after eating his breakfast he vomited it all. Has been fine afterwards, took him on his usual walk, no problems. At lunchtime gave him a dentastix, but again, about an hour later this time, it came back up. His behaviour hasn't changed, stomach not swollen. He is due another meal about six o'clock.
I am not an experienced dog owner, Larry is my first dog and I've had him for just over a year now. What to do? 