Terriers are meant to hunt rodents and other grounds dwelling animals, therefore they can be a bit hyper and tenacious, i.e., crazy. All dogs are bred for some kind of job, and most would be categorized, broadly, as working dogs. For convenience, they broke down the working category to hunting, terrier, and working (i.e., other jobs). There are subcategories within the working category, and working breeds can be just as hyper and crazy as other categories.
I refuse to have a pure bred border collie, but I've had 2 border collie mixes. Same smarts, just less hyper. The first one was half husky, easy to work with, but wanted to know what the school bus was and where it took the DDs'. Second is half Anatolian Shepherd, smart, protective, critical thinker, but Anatolian independent and stubborn at times. Wouldn't trade either one, and thinking of continuing with border collie/Anatolian mix, but might try border collie/great Pyrenees. Regardless, I'm sticking with half border collie.
