Wow thanks for all the info and help! You definitely brought up some things I hadn't thought of!
I hadn't realized the dog house was so small, probably definitely would be tight. We actually have a smaller dog house here too that I could maybe somehow add to it? Either connect it or just put them next to each other in the run. I have pictures of it somewhere I'll dig up or take new ones tomorrow in the daylight. It's maybe 5x5 (it's maybe a couple inches shy of 5 on the front) but inside I think is a bit smaller but it's also pretty tall. Not huge but maybe 4 or 5 feet, taller than this dog house. It's got damage on a bottom back corner though because it's not propped up and has been used to just throw stuff in for years so stuff lives under it I'm pretty sure but that's probably easily fixed and the floor inside I think is fine. There's squirrel damage inside too but jist chewing and probably easily fixed as well. But anyway, I know it wouldn't be able to hold all of them but I figure it could probably add some more room. Or at least shelter. But anyway, about the one for sale, I'd definitely put outside food and water and outside nest boxes in any coop but especially this one.
How hard would ventilation be to add? I'd be a little worried with the roof so low for drafts I'm realizing.
For the second one, unfortunately my mom's pretty squeamish about killing chickens or anything plus I think they're still producing so I'd probably end up just rehoming them and then someone could do whatever they wanted with them. But it would be kind of inconvenient.
You definitely notice things I didn't though, like the nest box and loose boards.
And about the run, that's definitely true too but I don't suppose it's possible to add on to one once it's built?
As for the last one, I think they mentioned something about having something to help load it but you're right that it may decide to not load plus we don't have a trailer anyway so would have to borrow one. I hadn't even thought about weight though. I mostly just liked the size but if I built it I'd probably make it not as tall.
If the bottom is anything like ours, it probably is rotted or chewed up some.
And maybe too heavy to put off the ground?
It's probably too big to not be noticeable.
You definitely bring up good points about the money too, I just thought it might be hard to find that size for that but maybe not. I think I'd rather just build my own anyways and sti might but the thing is I forgot my.dad's getting surgery a few days before they arrive so won't be able to help and I know nothing. Although I do have a book and could watch videos. I don't even think we have all the tools though but I might just have the store cut the wood and everything to size and then just screw it together.