OMG!!!!wat should i do my dogs started fighting

Ok i really don't know wat to do one day they r fine and the next day they r all mean and evrything.we had to take my little puppy to the vet because my whippett attacked her and then my whippett and mastiff tied into it really bad my jack russel has been at the vet for 3 days now and we don't know if she will make it.I don't think it is rabies or ne thing but how could i get them to stop.i mean they used to lay on top of each other at night and they would share evrything toys baths u name it they share it.But the whippett is the one that started it and shes older than the rest wat should i do????

I had a hard time figuring out the real problem here also. Could you give us a little more info on each dog and what actually happened between them?