I hope it is just a little tummy upset that is bothering Mojo.
Here is a link that might help you find affordable vet care:
http://www.humanesociety.org/animals...rding_pet.html
If you can, reach out to family and friends for a loan. Or think of things you have that maybe you can take to the pawn shop. As Judy has written many times, she took pieces of broken gold jewelry. Silver is hot right now too.