My 3 1/2 mo old puppy who up until yesterday seemed to enjoy going for walks will now just sit down in the driveway and not budge. He refuses to walk and will just sit there until I start walking back to the house then he follows me and goes back inside. My wife and I work during the day so hes alone in his crate and I really like to use my time before and after work to get him out on walks but if he doesnt want to go...I am not sure what I can do