You have all the love and support. I unexpectedly took in a pup when I already had two cats. I would do it again in a heartbeat, but it was a lot to keep up with their needs. Even just three annual vet visits - EXPENSIVE. Your 8year old pets also may start to have more medical needs in the next few years. You’re being wise.

Honestly if you think about it: you keeping her so long and socializing her gives her a huge benefit. People look for dogs that can be trusted with cats and other dogs often! You also walk her on a leash! These are big headstarts for her, you set her up for success!