Get Miss Mable some warm Booties to wear. Booties really do help with sore joints, just like us humans wearing slippers helps our joints when we're in the house.. or warm boots when we're outside.
I see so many dogs outside in our cold & they are limping from the cold. Digi goes outside with her booties & sweater on & she's romping around. Th eother day I was in a rush & took her outside bare naked.. She pee'ed ok, pooped & then the paws went up & she was limping from the cold... Bad mommy

I carried her back to the apt.
Mable might hate the booties at first, but after a few days of wearing them when shes awake, she might be totally cool with them on.
For "training" booties, go to the Dollar Store & get those ones.. They are cheap junk, but they are perfect for getting a dog or puppy use to booties. Then once the dog is fine with the booties you can get a better/warmer quality at a pet shop.
Also as she has short fur, a sweater might be a good idea for her too. Elderly humans get cold VERY easily. My Dad has to BBQ alive in his condo all summer long as his mother (he's caring for her to keep her out of a nursing home) is cold in the summer. She has a blanket on her all year round. I'm sure elderly doggies are the same. They just can't tell us they are chilly.
Bookmarks