I agree with everything smokeybear says but would add.

Remember, dogs think that we know what they are wanting or talking about when they bark or look at us, or whione, or jump up......We can use this knowledge to cease behaviours we dont want..... ie To stop a dog barking it can be really helpfull to link the barking with somethink the dog doesn't like...... such as by saying "Oh you want me to cut your toe nails? ok" and cut his toe nails (assuming he doesn't likethis toe nails being cut).

Dog thinks, "she thinks I want my toe nails cutting when I bark, bummer, stupid owner, Ill have to stop barking - I hate having my toe nails cut!". Dog stops barking.

Like SB says though people have different levels of tolerance for some behaviours and also different levels of energy/knowledge and or/time to resolve a problem.

The level of annoyance/irritation/inconvenience/danger/persistence of a dogs behaviour needs to be such that it motivates the owner to direct energy, knowledge, time and effort towards resolving the behaviour, for it to be extinguished.

In other words,
The reasons that some owners do not cease "unwanted behaviours" are usually one of the following.
The owner doesn't have the time,
hasn't got the energy,
the motivation isnt sufficient,
or they don't have the knowledge.

Most commonly, though of course is that the owner is inadvertently rewarding and therefore encouraging the behaviour, and doesn't realise it. A stern "No you bad dog!" thought of by many as a punishment, can often be a reward to a dog who has been ignored or alone all day! Any attention is better than no attention to some dogs.

Um...so what are you supposed to do instead? Just walk them round? I'm sorry but I see nothing wrong in redirecting a dog to more appropriate behaviour.

For Ruperts barking at the window whenever someone passed I just said "thank you" then lured him away, asked for a sit or down or something then rewarded him. For his jumping up and for mouthing I simply left the room for 10 seconds every time he did it then went back in and repeated as necessary. For the racing around whenever it was time for a walk I put the leash back on the hook and sat down with a book. I don't think it's practical in real life never to use some sort of "correction" or redirection.

I just think people need to keep it firmly in mind that they are dealing with an animal.
Animals don`t have good and bad behaviour. No, they really don`t. Why is it `bad` for a dog to eat food that is in front of him? The fact that WE think it `belongs` to the cat is not comprehensible to a dog. So feed the cat where the dog can`t reach it.
We have lots of stuff we`d rather they didn`t do. So it`s a question of training and shaping behaviour.
If the dog does something you don`t want, the dog hasn`t done `wrong`. You haven`t trained him enough. So why get cross and punish the poor dog?
This is why positive training works. You make it rewarding for a dog to do A, he will do A.
If you punish a dog for doing A he will not view A as `bad`. He will view doing A as dangerous if you are around.
Dog training really isn`t difficult. As long as you remember that
1. it`s an animal and animals don`t speak think or understand your language.
2. Animals don`t have a philosophy. They learn by experience.

hope the colour thing worked out ok - not sure how to multquote

But it's not about punishing the dog. It's about stopping a behaviour you don't want and showing what you do want. Such as noticing the dog is about to chew your sofa, interrupting it and offering an appropriate chew toy instead and rewarding the dog for chewing on that. Nobody's talking about frightening the dog or hurting the dog, just interrupting and redirecting. Or teaching a dog that a certain behaviour has a certain consequence such as the dog barking results in the leash going away and the owner sitting down instead of taking the dog out for a walk.