I will have to disagree slightly here. while I understand and applaud breeders who would be more hesitant in selling a first time dog owner without a fenced yard and only an apt, it does not mean that the dog owner would be a poor one. besides, I know of many people with dogs with big houses and gardens/fenced yards, but take their dogs out only once a day for a short 5min walk, IF AT ALL!!
I think the OP already coming on this forum indicates sincerity on her part in learning as much about dobes as poss, and very possibly she wants and will do the best for her new dobe. so with that, I am confident she would be a responsible dobe owner, potty training the pup as soon as possible, and also giving the dobe sufficient exercise.
I live in a 800sqf WALK-UP apartment (on the 4th storey!!), so it really was a @*(*&^%! to potty train my pup as I had to walk down and up 4 flights of stairs about 10 times a day. those were the days. now that he is potty trained, I still go out for walks with him 4-5 times a day, even if they are 5-10minute walks.
as for space in the apt, it depends on the layout. there are very few walls in my apt so there is actually surprisingly a lot of space for moonshine to run around and play with his toys. also, think about where youw ould put the crate for your dobe in the future. I also hope you that you know not to leave your daughter and the dobe alone without your supervision, at least not in the first few months (if at all!!)
now, that said, I find that living in an apt with my dobe actually made the both of us (and my guy) much, much fitter. we walk up and down the stairs just to go potty, and we also have some offleash run in the fenced park just opposite my place for about 15-20mins a day. you should consider that too - do you have a park nearby for your dobe to run offleash? it would help immensely. I don't let him offleash at the park everyday, but try to as much as possible.
having a fenced yard is not the end-all solution for dogs. I find that if I do not 'play' (throw ball, etc) with moonshine when let offleash in the park, he would DO NOTHING and stand there motionless looking at me! you have to be playing with them in the yard, in the garden, or park, in order for your dog to have the exercise that is needed.
a responsible dobe owner is just that, apartment or not!!
good luck!
