How great of you to rescue! I’m sure the rescue org’s are also sometimes overwhelmed, especially since the vols usually do all the work next to a regular job. If you call and speak to someone about a dog you’re interested in, you will be able to tell if they really know enough info about the dog. If not, ask to speak to the foster if there is one, or ask to have the dog evaluated by a pro. We had Amos and Luna evaluated by a trainer we use who is also a behavior specialist. It really gives you a heads up what to do/not to do with a specific dog. Although it’s fun finding out yourself, sometimes for safety of others (dogs and humans) it’s easier to know a bit ahead of time if a dog has some issues. In my experience, most issues can be brought back to a level that they are liveable. And I think it’s good to accept some of the quirks an older dog may have and love them for it!