Coyote Pup Distress calls may work much better than Prey Distress calls while the coyotes are raising their young. Food is plentiful and with the hot weather, they don't need too much food that produces body heat like they need in the winter.Use their maternal protective instincts and go with Pup Distress.
Get an open-reed coyote howler/distress and learn to talk coyote as well as prey animals. The Li'l Dog Howler by Primos is a very easy to blow call with two mouthpieces and instructional tape or dvd and gets attention....
Grayfox taken with Ruger M-77.22Mag & Li'l Dog Howler/Distress: