I have a rotty that is about 4 years old and 3-4 weeks ago he started throwing up. Not really at any certain time. It is normally just a yellow liquid (maybe acid?). Sometimes he does not want to eat and other times he eats fine. He throws up at least once a day. He is still very active and happy other than the throwing up. I thought about getting him some stomach acid tablets to see if that would help but did not know if it could be something worse. He has not lost any weight, still drinks water but not excessively. Any help is appreciated.