They are still a dog. A Shepard isn't a security dog until trained, a Labrador isn't a guide dog until trained.
As most dogs do unless trained not to, Jacks will chase something for fun but won't be a hunter unless trained to do so.
I had a Pitbull that would point and fixate on things but this was encouraged by me with tone, excitement in my voice and words like "what's that" and is not something that came naturally.
I’ll believe this when you teach a border collie to hunt or a bloodhound to herd.
Breeds have natural instincts to do what they were bred for (you’ll often see collies ‘herding’, pointers ‘pointing’, hounds ‘tracking’, shepherds ‘guarding’ and so on... without any training whatsoever.)
You train the ‘command’ in order to refine it, control it and/or modify it to suit your needs.
So a trained security dog might be taught to bite arms and ‘take down’ an intruder, while my girl will bark and bite whatever she feels like biting.
A Labrador isn’t a ‘natural’ guide dog- thus why they must have extensive training to be made guide dogs (they are retrievers after all...). And FYI it was the GSD who was the first guide dogs, but they were eventually disused as they have a higher aggression than Labs.
Jacks can take on anything and everything because that’s how they were bred. It’s in their genetic code to be little nutters. High drive, high pain tolerance, high determination, low fear... in all a little dog who thinks he’s a lion. They won’t look before they leap because that’s how’re they’re bred (because a dog has to be pretty insane to take on a predator twice their size as they were bred to).
To reply to vamp’s statement of a bulldog who won’t bother with small dogs, again, how they were bred to be. They’re bred to hang off bulls, not bother with rabbits. They don’t have a very high prey drive at all so a small dog is hardly a bother to them.
And to bring up the pitbull debate (oh boy, here we go...).
The American Pitbull Terrier was a born fighting dog. High aggression, high drive, high determination, high pain tolerance... they were not bred as ‘pet’ dogs. No one in their right mind would want one as a pet- they were bred to kill and kill and kill. Most ‘pitbulls’ around today are staffy mutts- and no one in Aus has a ‘real’ APBT- any I’ve seen are staffyx, amstaffx, bulldogx or mastiffx. I’m willing to bet over 90% of ‘pitbulls’ don’t have a single drop of real APBT blood in them.
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I worded that wrongly, I dislike keeping small dogs usually. i don't mind them in general other than very little dogs like chihuahuas. Chihuahuas are the scariest things ever.
I work with GSDs including handler aggressive rescue dogs.
Only dogs I’ve ever been bitten by was a spaniel, chi, and some Maltese mix. And the neighbours shiba has a thing about biting my shoes...