It could be any number of things, but if the dog is active with other animals, or has had contact or ticks, I'd look at Babesia as a strong possibility.

Offer the dog fresh raw liver, if he/she won't eat it offer it cooked. Give some Red Cell and if you answered yes to yourself to the above possibilities at the very least run that dog on Doxycycline for no less than 10 says (2 x's daily).

It is important the dog eats but small meals are best.

Read the information Jack has provided here:
http://www.thepitbullbible.com/forum...o-Beat-Babesia

Good luck,
S_B