How your furbabies do with stairs...

[Mizunomae]

Hi there, I've been reading around the forum in some research for an adoption I'm planning on some time in the next year or so and I was wondering how the toy/miniature dogs do with stairs in the house.

does anyone have any recommendations of any breeds that they have noticed have a lot of trouble with stairs? Trouble on wooden but not so much with carpeting? theories on what size is too small to deal with regular stairs? Or am I worrying needlessly? I've read of some breeds like doxies that have trouble sometimes because of their long spine and was just curious about everyones personal experiences. Thanks for any input!