A friend of ours has two 3yr old small mongrels, littermates which she kept from an unexpected litter not realising that keeping littermates together isn't necessarily a great idea. She's now got a small child, a house move and fairly big change in circumstances coming up and is looking to rehome one of the dogs. We are looking to take in a rescue dog. So far, so synchronous 
What we know so far:
- Both great around kids
- Male neutered, bitch would need spaying
- Male fully housetrained, bitch habitually wees indoors
- Both prone to barking when a new adult enters the room
- Neither particularly well socialised with other dogs
So whichever we took there'd be training needs, which is fine. I know what food they're currently on, they live close enough currently to stay with the same vet. We've visited them at home, the current owner is going to bring both dogs here, separately, to see how they behave 1:1 with us.
So before I get all excited and start shopping for dog beds and training treats, what else should I be checking/finding out before we agree to anything?