repeated attempts to vomit, usually without result, or bringing up only mucus or foamy
mucus. Distress, eating or attempting to eat twigs/grass/debris/ (in an attempt to induce
vomiting probably)
That is one crazy vet who is not prepared to wait until Tuesday to be paid, when there is a dog in distress! I would by-pass that vet perhaps, and take your dog to ER or another vet if possible. Say that you THINK the dog's stomach has flipped, and that if it is the case it is an emergency.