Do you think there is ever a place for negative re-inforcement in dog training? If so, in what forms is it acceptable? A firm 'no', a smack/slap, or do you think rattle botles and training discs are a good idea?

Discuss sensibly please.

Depends on the type of behaviour being exhibited , in agression cases i thinkits best to find the cause of aggresion first before going in with harsh rattle bottle tacticks as fear its self is most probably the cause , therfore making an already nervouse dog worse , I guess in our case we are lucky our girls are not naughty they are very chilled out and well behaved , if a times a little cheacky but thats about it and therfore a no is usually sufficient .

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a no seems to be working for ours or if they are excited say about going out and wont sit still to put their harnesses on, we stop and ignore them till they calm. have not had to smack them and do not want to go down that road. as for the rattle bottles, they seem to work on dog borstal which is the only thing i have seen them on, but do not know enough to comment on them personally.

have never heard of rattle bones? i imagine there a bone that rattles lol but my sisters stud dog (jack russels) can get very naughty at times when he isnt being put to a ##### and can try an #### ur leg my sister uses a empty plastic bottle filled with some stones and he stops as soon as she shakes it?

Same here.

First thing we taught the pups was the word "no", reinforcing it positively. If you can teach a dog the command "no" and "leave" comprehensively I don't see there's any need for anything more than that. I don't believe you can have a dog that never has to be corrected on occasion but there's no need to use physical force.

A firm NO has been used with mine other than that nothing negative.

Well we use Leave. more than No, for some reason No makes Phoenix jump. whether it's the way the word sounds , not sure. i think No can be sharp and he is a bit timid, Leave is a longer word and i guess i say it firmer but in a lower tone. Leave works every time.
i to prefer positive re-inforcement, Carrot or no Carrot .

Oh and I use "oi" as well. That works pretty well for getting their attention!

Ours is a very firm 'stop'

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Mine react to NO infact they hit the floor and start slithering towards me people laugh