Thus far I've stayed out of the last bit, however since Liesje responded I'll take that as an okay to respond to the current topic (it's her thread after all!!)......I have shared my life with a diverse range of breeds....Shelties, Labs, Papillons, Cairn Terriers, Schnauzers.....all quite different in their needs and dispositions. I've also "worked with" many others (including my recentlly fostered Staffy mix), so I have a bit of an understanding of how dogs differ! And within a breed I have extensive experience with Labs and Schnauzers specifically, two breeds of dogs that are, in all honesty, at near opposites of the same spectrum. Labs are goofy, biddable, owner-pleasing animals by nature, Schnauzers are independent, sometimes full of 'tude, self-thinkers that are highly intelligent and follow their prey drive instead of bring it back to you. *G* However the biggest thing I have noticed is the vast difference even within the breeds. Not all Labs will be biddable or easy, and not all Schnauzers have a crazy high prey drive. And, I have seen my share of Aussies that were by far not "easy" or always handler focused. Aussies I find are "focused".....what that focus is on though may change dramatically through a dog's life. *G*
Now, I will be the first to admit that my schnauzers are "small". They simply don't have the brute force to do much - on their own. I can handle them more than easily. However, when you pair up three schnauzers on one walk, with one human, the odds begin to match any single larger dog. Three small dogs, all exerting the same force in the same direction, ends up being more than the individual weights of all three. And as soon as you get a multiple of anything, difficulty increases dramatically. So when a prey item crosses the path on a walk, or one dog gets upset which in turn causes the other two to go on high alert, you are now dealing with one, large, strong, three-headed individual for a period of time. And in terms of speed, well, my Mini's easliy catch any larger breed dog, whether it be Aussie, Pitty, Kelpie, etc (I say this because they have!! The only breeds I would say they cannot catch are sighthounds), so once gone I have no chance of catching them.
But.....the dogs are not always a big three-headed monster anymore, and that came through training. We can walk through most situations without too much fuss, although sometimes there are things that crop up to try to bring it out.
And it's not just about size when it comes to sensitivity.....Gaci has snapped plain snap collars, she has run through bush and come back with burdocks in her entire body, matted so closely clippers could not even clip them out, she has ripped out toenails in her feet in the hunt, when it comes to environmental sensitivity I really don't think something like an efence would even come into play with her, she'd bolt right through it to catch what she wanted. Shimmer cut her pad, badly, at the beach one day, but did not show any signs of being in discomfort and continued to run....I didn't even notice it until the next day. On the other hand a stern voice sends Shimmer into oblivious upset, and with Gaci getting stern often just gets her more hot n' bothered (she's a funny gal!), so sensitivity is really quite situation-specific, and I have a very, very good experience with predatory drives, as I live with it each and every day, every time the dogs go out to pee.
I say all this because I just wanted to emphasize that it can be done....yes it takes more time than collar corrections (sometimes), and I'll even say I put in the odd "Cut it out" to them in a stern voice (although I try not to with Shimmer), but I'm just trying to portray that just because we don't own "Bugsy" or "Chuck" doesn't mean we either haven't at one time had one of those, or that we don't work with dogs who may borderline those types of dogs (although Bugsy is one of a kind!!!! ). And I'm not even saying someone "should" do it that way, or that you shouldn't use the collar of choice you want to use - I try not to judge, I really do, but it's more just an acknowledgement that some of us have been there too, and we have dealt with it, and worked through it, in our way and it can be just as successful!