I have an 8 year old pit bull, Harley, who about 5 days ago started acting funny. He hasn't eaten any dog food, but will eat a little bit of people food here and there, He's been drinking plenty of water. He hasn't pooped in 5 days, and he walks around with his head down. He hasn't barked at anyone that comes over like he always does. When I let him inside, he lays on the couch and pants hard, when he breathes out he shakes. And this morning I noticed his testicles were very swollen. My boyfriend tried to touch them to see if they were hard, and Harley nearly attacked him because it hurt. I don't have the $300 to take him to the vet, and I have no idea whats wrong with him. Can anyone help me?