Neighbor leaving dog at backyard 24/7

I have moved to my new house for over 1 year now. Everytime when I decide to look at the window I always see a husky walking or sleeping in the backyard alone no matter what time, cold or hot weather. I feel really sad about it. I don't know is it legal to do that in Perris, California. I don't know should I call the animal control or cop about this because I don't want to make any problem with my neighbor because I live next to them. What should I do?