Sad to say but many people who move to Arizona have lost their pups because of the many predatory animals we live with in the desert. What is scary to me is that many of these coyotes have gotten very used to people and they walk our neighborhoods like a normal dog would. I was out walking 2 of my little ones and I was being stalked by a very aggressive coyote even though I had picked up the kids. Luckily a man came along with 2 big shepards and he let me walk with him back home. Needless to say I don't walk my little ones anymore (I have a big backyard that is walled) so now I only have to worry about the hawks, the owls, the snakes and maybe an occasional bobcat or mountain lion.
My little guys never go outside without me.