I have a 1.5 year old mini rex. He ate some Oxbow food this morning. I left for 3 hours and when I got home he was lieing down and not wanting to get up. He won't eat. He refuses to move around. I lifted him up and he was just still and allowed me to hold him. He typically lets me hold him for about a minute before he wants to get down. I don't know how to help him or what to do. Please help.