A final check before you take action – is your dog actually vomiting? If they're gagging and spitting up a white, foamy substance, it’s likely not vomit but phlegm, a symptom of kennel cough ...

Vomiting in dogs is very common, and it can be a sign of lots of things, from mild to serious. Some dogs will vomit once and then seem fine afterward, while others will vomit regularly.

Tapeworms are flat, white worms that are made up of tiny segments ... Then you may actually see a worm (maybe 5 to 8 inches long) in your dog's vomit. If your dog has a heavy tapeworm infection ...