it would get lot of exercise plus lot of bike work as well, you right good size for your house ,but hell of a watch dog Yeah that's my thinking, bit smaller than a GSD or Rotti but still a formidable guard dog. Perfect for in the house As forest of dean says though the problem is finding one and not paying silly money for it, I've seen them going for a grand Kelpie do what you want an easier to find
Aye that's a good point actually I never though of kelpies, easier to find from working stock too
I do prefer the look of the ACD but not enough to pay a grand for one