I adopted my 5 y/o pit mix, Tulip, about 3 months ago. Just within the last few weeks, when she's on walks or going from the car to the house or vice versa, she lays down and refuses to walk. She's always been into passive resistance, but i'm not sure what her deal is on this, particularly as it's been so consistent the last few weeks. She's not injured, nor overheated, nor exhausted (she gets PLENTY of rest on the couch, believe me). One thing that occurred is that, between going to daycare during the day and then being home with us at night, she's not getting a ton of outdoor time. Could my pup simply be saying, "I NEED TO SUN MYSELF IN NATURE, MOM!"? Any other ideas? My back can't take much more of this (she's 60 lbs.) Thanks!