He is very small...about 4 to 5 pounds. he usually jumps around all the time and gets on and off the beds and stuff. now he jumps on and then lies at the corner whining until we pick him up and put him on the floor. What is wrong with my dog?

Oh. and we have always had steps for him to get up and down but he stopped using them to down.....he uses them to get up so he knows they are there.