What is best for the dogs??

[BC_MoM]

In all honesty, I would say take them with you. Why not go out one day and help your grandfather find a new furry friend? There is no way I'd ever be able to leave my two behind. I'd have to stay with them! They are my babies. I understand, though, why you are having a tough time. But I really think they would like to go with you!

[Tollers-n-Dobes]

I've read this thread a few times and haven't really been able to come up with any good advice.

It sounds like an extremely tough decision, but if they were mine, I'd probably take them with me (and fence off part of your land for them..). I'd also try to find your Grandpa a dog of his own as well. Good luck, whatever you decide to do though!

[Kfamr]

Personally, there's no way I could part with my dogs. While dogs are highly adaptable animals, their lifestyle may have to change - such as being outside a majority of the time, being let loose, etc.

As your dogs are let loose a majority of them time (unless that's changed?) there are many deadly animals they can run into - including scorpions and rattlers. The heat in Arizona is intense and extremely dry. They will most likely experience dry, flaky skin for a while until they adjust. I would also advise you that they are kept inside a majority of the time because of the heat.

I would highly advise you to fence in an area for them.