my little mixed breed rooster (Muffin) recently layed down ALOT. i always thought he was just relaxing. but i picked him up and his legs seemed stuff and shaky. i tried putting him down but he just would lay on the floor. then i put him down again and he could stand up. he ate and drank for a while and preened his feathers. then he collasped down again. he stands up for a while, then collapses with his wings all spread out. Is it a disease? leg condition? he is currently staying in a dog crate in the garage with food and water right in front of him. he is on fresh pine shavings.