My Dog Is Throwing Up White Slime. More often than not, this can be a sign of eating too much grass or digesting too much dirt. Determining whether a dog vomiting clear liquid is a problem depends on the other.
The white foam is a mix of saliva and beaten gastric juices. The material may appear to be vomit but could actually be mucus and fluids from the respiratory system. You may also notice your dog having the following signs:
