My dog is having bloody diarrhea and is vomiting, help?

my grandmas dog had that and they took him to the vets and there was something wrong with his stomach, so they gave him some tablets to take and kept him there overnight....but before he had an operation for a different thing, the vet said something completely different to another vet. i strongly suggest you get a second or third opinion from another vet because they all are different and want more money from you. like, my grandmas vet suggested he has an operation and actually he didnt need it, they just wanted to charge more money....so, definately go to a different vet :)xxx