What usually causes a dog to throw up?

My Vet told me, if my dog throws up once a month, it's nothing to worry about. So, when is it time to worry?

bad comparison but like humans, when the dogs throw up are loosing liquids and electrolits and becomes dehydrated if that happen very often. I mean several times in a short space of time.

actully it is bad for the dog to throw up once a month!It loses eletrolights!

I have two of my own dogs and two cats....and each one of them hairballs or throws up at least twice a month. If your dog is an inside dog, throwing up can be cause by hair or fur or dust in the air...or even eating to much. But if your dog is an outside dog those same things apply. But the most comman reason for a dog to throw up is because of the eating and digestion of grass. Really its nothing to worry about, just make sure hes in good health and gets check ups 1 time a year.

I suspect it ates something that did not agree with it. that is usually the cause for such. Here is a URL that you could also look at.. It is a GREAT URL concerning dogs and dog illneses, etc.http://www.srdogs.com/Pages/care.gt.html

Once a month is not bad. It's probably got hair or grass that he's trying to expel. If he starts vomiting more frequently or starts and won't stop, take him to a vet. Also watch his water and food intake. If they go down or stop, take to a vet. If your vet said nothing to worry about, believe your vet.

not enough water! something they ate! maybe a stomache viras! they eat grass to throw up when their stomache hearts!

My dog throws up occasionally for many reasons: hairball, ate too fast, whatever. I usually give her white rice mixed with cottage cheese or dog food for one or two meals afterward just to help settle her stomach.If your dog vomits more than once or twice in a single day, starts acting sick, like not as energetic as usual, not interested in food or water, then you can worry.

it's possable your dog has something stuck in it's troat and it's trying to cough it out,have your vet. do an X-Ray,not guess work.