My guinea pig Felix looked sick last Tuesday, but my mother was out of town so I fed him some banana and some lettuce a little later. He wasn't drinking or eating much at all, and my mom came home and we took him to the vet at one in the morning on Wednesday. He was diagnosed with an upper respiratory infection, and he was prescribed Baytril, but still didn't eat or drink. On Thursday we took him to a different vet where he got a good prognosis and critical care. We syringe feed him critical care 4-5 times a day, but he still doesn't eat or drink much. We also got a probiotic from the vet which he gets once a day. He ate a little lettuce on his own for one night, but now he's not really eating anything but critical care. He pulls his food (lettuce, hay, crunchy bowl) in his house he has in his cage like he wants to eat, but he can't. When we put crunchy pieces in front of him on the counter, he picks them up and then lifts his head up and down repeatedly before dropping the crunchy piece. He gets very discouraged, and we took him off of Baytril 2 nights ago due to bad reviews online. His teeth are not overgrown in the front, and we just don't know what to do. Does anyone know why he won't eat or what lifting his head up and down with the crunchy piece in his mouth means? He's 2 pounds and will be 3 this June. Thanks! 
