I used 1.5 Montgommery round jaws and caught coyotes, but you really have to be dead on with trap placement. I have purchased myself several # 2's for next year and will be targetting them hard next year. Anyone setting for fox, with coyote present should use as a minimum a number 2 trap. My modified 1.5's will hold any coyote without a question, but the jaw spread and coyote foot size is the real factor.