Originally Posted by starbuck8
I would be more concerned about the little guy not drinking enough water. Is your Mom still giving him water with the dropper to make sure he's hydrated? It seems strange that he doesn't want water.
I don't know where your Mom lives in Fla, my parents live there and I know there are some vets that have an after hrs/wkd answering services, and they can get a msg to the vet about your concern. The vet will usually call you back or relay a msg to the answering service for you. Ask your Mom to call her regular vet, even though it's Sunday, and she just might be transferred right to the answering service. If not, keep on trying other vets until she finds one that does.
Also, in addition to what Allheart said to feed the little fur babe, your mom may want to try baby food. They are easy on the tummy, and have lots of good nutrients.
Good luck to you and your Mom :)
ps. I just can't seem to get a mental image of what in the world a chihuahua/blue heeler would look like?! Seems like an odd cross. I would love to see pics if you have any!