It's hard, as people who want more than just a cuddly couch pet, to share a dog, IMO. Unless both of the people enjoy training and working and playing with the dog just as much as the other does. I think it's easier for regular pet people to share a dog, because the dog is just there as a companion and something to pet and play fetch with. And I don't mean that in a demeaning way at all, I just feel that it's a little different for those of us (like most on chaz) who enjoy working with dogs in other ways and want different things out of a dog.
I'm not married nor am I even dating anybody and I do still live with my mom, because financially that makes the most sense and we both like it this way, so I guess it might not be exactly the same sort of situation as it is for people with significant others. But in our home, the dogs all make it clear that they are mine. Keira and I have really bonded within the last year, which makes me feel bad, as she was meant to be mom's always. And I still call her mom's dog, but she now acts just as much mine as Ripley and Dance do. We joke that we share custody of Ripley, but he's pretty well been mine since day one. And Dance was always meant as mine and so is Koolie puppy meant to be mine. And even though the Dobermans weren't necessarily intended that way, I am the one who instills rules and structure for them, I train them, I work with them, they sleep in my room, I feed them most of their meals, I play fun games with them, etc. It's natural that they all sort of became mine regardless of whatever we refer to them as.
For this reason, if I am still living with her when my mom gets her next dog, I am going to try and not do as much with that dog and make sure mom does. I feel really bad sometimes that mom doesn't have a dog that's truly hers anymore, and I think she misses it. The reason I kind of took over Keira and ended up bonding closely with her is because she and my mom's personalities do clash on different levels, and they just frustrated eachother, and life is a lot more peaceful and quiet now that I take care of the things with Keira that caused chaos for her/mom. Keira is a much calmer, less frantic dog to be around. And mom enjoys a Keira who doesn't tremble and screech and run everywhere with excitement over nothing.
Of the dogs who were meant to be mine though, I kind of feel a little possessive over them, haha. That sounds terrible, but it's true. Tango, Dance, Koolie puppy... I don't want other people interfering with them. They are 100% mine and I want them to be more close to me than my mom (or my brother for that matter, but he doesn't have much to do with the dogs by choice). Other people can love them and play with them, but at the end of the day, they are mine.
I feel like I just rambled about nothing, haha. That's what happens when I post before bed. But anyway, I think I will always be the type of person to have "mine" and "yours" and "family" separated dogs. I mean, the whole family regardless enjoys the dogs, but it's just a whole different relationship with a dog that is really and truly "mine" vs. shared. And I don't think there is anything wrong with that. Everyone I am sure would be more than happy to experience a dog that is mainly theirs. The dog/s still bond with everyone in the family, but there's just an extra special bond with one particular person.