Friend of mine knows his stuff well on terrier's , digging , etc.and would tell you how it is with dogs he's had or others , even if one thought was bees ees , he tell u how get on in a different place or gameness. He's having good success with hard dogs , the well proving. And not doing bad on the numbers . my own dogs have good voice barking and suit me .one in its fourth season and had three foxes this season , only the first one it has barked at , and when it went ground with same one was mute second time with it. Me other dog is off hard dog , is giving good too , at times