I have really good luck with pup distress. I used to use a powerdogg but now I have a firestorm and I dont know what the sound is called but it is pups whining. I think maybe its called 'coyote death cry' or something like that? I also do well with jack distress, maybe cottontail but no so much. ANything that sounds like its dying a painful death!
But like demontag said, they are really interested new sounds too, I've called them in with rodent sounds and just messing around squeaking/squealing on my mouth calls too.
