
Comes from the fact that most (all?) animals have FAR more power in closing t heir jaws than opening them, and bull breeds have just the right type of jaw and HUGE muscles on their jaws that mean opening th em against the dogs will is very very difficult.
Its not at all impossible, and the jaw doesnt 'lock' in anyway.
I recently heard this about RATS of all creatures, not true about them either.
Regarding aggression - it needs to be understood. Aggressive behaviour has its root somewhere, every time. No dog is ever aggressive without a reason. Ever.
Aggressive behaviour in any animal is always an option, from elephants to tiny beetles, and everything on the way .
For some types of animal it comes more readily than others and for animals who dont have hands and voices to warn people off with, they are left with teeth.
Some dogs aggression is based in fear, some in territorial disputes, some because theyve learned its a tool that works to get them what they want, some because they are ill.
Some of these dogs will have had horrid experiences where they have been forced to use aggression - the dog on teh lead frightened or attacked by rough out of control off lead dogs springs to mind here. He cant use flight,freezing is going to do no good, fiddling about wont either so all hes left with is FIGHT. Next time it looks like things are getting scary in the same situation, he goes for FIGHT first, after a while he can become the kind of dog who lunges and snaps and snarls at teh very sight of another dog in the distance.
Some of these dogs have come from a long line of parents for whom aggression, willingness to fight before doing anything else, has been accidentally or purposefully bred in.
One of my dogs is like this, his parents and grandparents are all dogs who are very fearful, VERY quick to react and seem to go for aggression first. I am having to be UBER careful that he is NEVER pushed into a position where he thinks to fight - so far im winning.
If i put him into a strange kennels, or let someone he was fearful of back him into a corner, no matter how good their intentions, he COULD be pushed too far and be forced to use aggression. His brother already has, because HIS owners believed no dog shoud ever bark or growl at them for any reason, and they punished him for it and didnt give him space to become accustomed to things. As a result he lunges and bites first and asks questions later, i doubt it will be long before he bites someone in a public place. :(
I dont believe attacks are EVER unprovoked, its just a matter of understandign what the provocation WAS and is that a fair reaction or is it something lacking in the dogs training or socialisation, or does the dog have a health problem.
If i go now and push a pencil into my dgos ear and he bites me, thats fair surely, no dog should have to put up with pain. So why the surprise when a dog is unhappy with somethign painful a vet may do.
If i try to sit on my sofa and my dog is on it and she bites me, thats not fair, but she still has a reason to do so, probably because shes learned that by doing so she gets left on the sofa, possibly the first time she was hurt by someone pulling her off.
Whilst the provocation in the first scenario is fair and in the second whilst also fair from the dogs point of view is caused by poor management and lack of training, both situations could be improve or even prevented by teaching good bite inhibition.
The problem there is that that involves ALLOWING puppies to bite in play and warning them when its too hard - gradually you teach them that humans should never be more than touched by dogs teeth. Dogs who HAVE learned this are dogs who will warn, air snap and if really pushed, gently bite - my scenario with the bitch on teh sofa , my bitch, is just liek this, whilst some idiot has taught her that biting makes people go away, fortunately that same person taught her never to bite humans hard.
Many people will punish dogs for play biting, and never give htem any feedback as to how hard is 'play' and how hard is 'game over'.
Many MORE will punish dogs for warning that they feel threatened by growling in the mistaken belief that the dog will know NOT to feel aggressive. That doesnt work and what you are left with is a dog who knows that growling adn warning will BE punished but still feels threatened and feels the need to use aggression. These are usually the dgos who bite 'unprovoked'.
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And now tis time for Ems to go to bed!!! (up all night)