Vomiting, Canine - contd.

ClinicalSigns
Nausea will sometimes cause dogs to salivate.  They may vomit food, clear liquid, stained yellow bile, grass or blood. Depending on the underlying cause of the vomiting, the dog can have a good or poor appetite, diarrhea, dehydration, or other signs.  There can be weight loss if the disease has been going on for a while and the gums may be tacky or dry from dehydration. 

Symptoms
Owners frequently indicate that their dog has been salivating and vomiting whole undigested or digested food and a foamy fluid that may be yellow from bile, clear, or have blood in it.  Some people report that their pet eats grass and then vomits the grass.   Some dogs may maintain a good appetite, while other lose theirs entirely.  There can be weight loss if the disease has been going on for a while and the gums may be tacky or dry from dehydration.