BTW, I do appreciate the perspectives that are telling me that it is easier on a dog. I mean that makes the decision harder but it is worth knowing.
She's a 40 lb dog so I originally was hoping she'd get 14 or 15 years (she is mostly husky and they are known to be longer lived for their size from what I have read) but I realize 12 was more like realistic average/time to expect (and at this point I think 12 is the most I could hope for regardless of what she has even with treatment. I doubt if she has cancer I'd be able to give her more than that).
Damnit, she honestly is one of the best dogs you could hope for (I'm not even a big dog person. She'll probably also be my only dog). And I don't think I'm saying that out of pure bias, she is really the ideal dog for almost anyone. She loves everyone, she gets along with everyone, she's very good at reading people and knowning when she should calm down, good with kids even when they're being rough (my friend's kid when he was 1 or 2 pulled her ears and she yelped but didn't do anything but back away from him), she's enthusiastic, pretty obedient and hell, you don't even have to scold her, she's very sensitive and even when I tried not to let her know when I was upset (potty training her years back and reading that you should not scold the dog when you find an issue after the fact) she'd know I was. She's great with my cats (Even the asshole who keeps attacking her, I had to let her know it was ok to snap at him and that's all she does even though he keeps pushing her. And with my last cat who was a super nervous cat she was very gentle around... my husband used to complain the cat was more comfortable around her than him <- my cat took 16 years to forgive him for taking her to get spayed and then she passed away
). The only things I could say she did bad was more my fault for being a bad owner (I got lazy about walking her and more recently she's gotten into eating things she shouldn't but that's my fault for letting her get that bored). I honestly think she was wasted on me, she would have been a great family dog (and she would have loved it too. I gave her an ok life but I think she'd have been so happy to be with a family with kids who were active).
If nothing else I don't want another dog because none would ever compare to her (and she put up with the fact I was a couch potato. That alone has me decided cats are better for me. But still, even if I wasn't a bad candidate for a dog due to couch potatoness... I don't think I'd ever find as good a dog anyways).
Sorry, I'm rambling. I don't take even worrying about my pets well.