I have caught hundreds of coyote with the MB 550s, you WILL like them! I have never tried the dogless. The dogs on the MB-550 are like 99 ct a piece. I have only had 1 trap in 6 dz ever get bent up so bad I couldnt use them. MB 550s are a really good out of the box trap that need little adjustment to work well. I just degreese them and Formula 1 them!