I am curious, what makes you (terrier owners) think that your terrier has herding instinct? I've never been around them, so I have no idea. But I know quite a few members have said they would like to try them out on stock.
Herding is truncated prey drive. Terriers tend to have loads of prey drive
Kaiden will help move sheep, nothing formal. I used to look after a friends sheep farm (their retired and got out of sheep) a few times every year. Dekka is pretty decent too but gets carried away and wants to bite the sheep. Both dogs want to control the sheep vs just chase them. I think sheep are too big to just run up and eat lol.
I don't see the big deal. Its like telling people who own pugs, or other non typical agility breeds why bother? BC excel in agility too, yet loads of people want to do sports with their dogs. Its about enjoying the dog you have ALL the time, not just for sports. I mean why bother doing dock dogs with Dekka? She's not a water breed... and she is little so will never get the big titles.
I do all the things I do with her because WE enjoy them. Do I care if she will ever make it big in dock dogs? No. She loves to go SPLASH lol I love watching her have a great time. I would like to try herding with her, when lure coursing she does the same thing to the lure that the BC do (OMG why LC with BC!!??!! the insanity of it all) and tries to control it vs chase it.
Not all that long ago herding dogs were dogs who herded, not just select breeds. Not saying terriers would rock herding, but who says they can't do it?