My first Yorkie Trixie used to decide when and how far she would walk.When she thought she had walked far enough she would just lie down with her paws in th air,then you would have to carry her back.
One day I was carrying her back she was fast asleep in my arms with her head nearly dangling and everyone we saw thought she was dead!
Trixie was very particular where she walked,anything she didnt like it was lie down,paws up,help mum!