I put one and two.
Milo is mine...I care for him, pay for a lot of his stuff, if I get my own place he'll come with me.
I live with my parents, and they have a wheaten terrier, Benji. I play with him and see him on a regular basis, but don't do things like groom or take him to vet appointments or pay for him...or train him.
Then there's Zach's parents dog, Giselle, whom I talk about quite a bit. Zach lives with them and I spend a lot of time there...plus we house-sit/dog-sit a lot for her.