What is happening to our animals?!?

I live in a subdivision with them all around. We foster cats, and they have been dissapering.. We have had rain all week almost so maybe coyotes are coming around but i have no idea. We checked the pound for our kitty and it wasnt there... Its a white fat cat with 3 legs(Born that way) and the prettiest eyes...It was a spayed female...And it always sat in our yard! The about 4 days ago in the morning was the last time we saw her... No idea where she is..And BEFORE that, One of our black male cats looked like somone is playing a sick joke. Its tounge was almost chopped off, bleeding and turned black. It didnt have tire marks, but it broke is tooth and its jaw...unfortunatley we had to put it to sleep. The vetnarian had NO idea what happened. And BEFORE that, my aunts grey cat went missing. What is going on?! (we checked the pounds, too.) Is someone playing a sick joke? Our neighbors are stuckup and i bet hate cats... it depresses me..