I have to repectfully disagree with you on a couple of points , goundhogs , woodchucks call them what you want are not any kind of a challenge for a terrier , you'd be better off with a ferret !!!! pissing around with an animal thats running away and trying to suffacate your terrier in the bargain, been there done that, got the Tshirt , i'd rather not go out than piss around on groundhogs
"Any dog that is up over 14" and 20lbs is only getting into coyote and bear dens around here for proper earth work and good luck to them."
Maybe where you are , but there's plenty of places around here t