So as to not high jack the other thread, I thought I might start a new thread on when punishment might be justified. I am aware that some people might be of the belief that it is absolutely never justified. I'm of the belief that there might be rare cases in which in might be justified. Be aware here that I work with human behavior, and my examples and references will be from texts about humans. However, principles of behavior apply to all species, thus I am not worried that these examples do not apply to dogs or other animals.
I feel first, it's very important that we start with definitions, thus we are all discussing the same thing and using the same terms. So, when I use these terms, I mean the following:
Aversive stimulus or aversive: an unpleasant or noxious stimulus; a stimulus change or condition that functions (a) to evoke a behavior that has terminated it in the past; (b) as a punisher when presented following behavior and/or (c) as a reinforcer when withdrawn following behavior.
Punisher: a stimulus change that decreases the future frequency of behavior that immediately precedes it.
(Cooper, Heron & Heward, 2007)
Punishment might be justified if:
"(a) the problem behavior produces serious physical harm and must be suppressed quickly,
(b) reinforcement-based treatments have not reduced the problem behavior to socially acceptable levels, or
(c) the reinforcer maintaining the problem behavior cannot be identified or witheld"
(Lerman & Vorndran, 2002).
Of course, in giving these possible justifications, it is assumed that an assessment to determine the function of the behavior has taken place. Such an assessment of the type that we would use for a human (a functional behavior assessment) doesn't exist in the in depth form for dogs as it does for humans, however, it is possible to adapt some of the methods of determining the functions of human behavior to be used for assessing the function of the behavior of a dog. For example, it would be possible to collect data and record the antecedents and consequences of a dog's behavior in order to determine a possible function.
And, if using punishment, one should be aware of the potential side effects. These can include emotional or aggressive responses, particular when using positive punishment in the form of an aversive stimulus. Attacking the person who delivers the punishment can occur. Pain-elicited aggression, and aggression which enables the organism to escape or avoid the punishment is possible (Cooper, Heron & Heward, 2007).
There are also other types of escape and avoidance which can occur, and these can be a bigger problem than the behavior the punishment is intended to treat. A student who is punished for sloppy work may stop working all together. A child who is punished for being honest and admitting that he has broken something may begin to lie, a dog who is punished for a sloppy retrieve may stop retrieving altogether.
Behavioral contrast refers to a phenomenon in which there is a change in reinforcement for one behavior, and another behavior increases, despite no change in reinforcement for that particular behavior. My book gives an example of a child eating cookies before dinner in the presence and absence of his grandma. Grandma then begins to scold him for doing so, and he stops doing it in her presence. He also begins to eat cookies more when unsupervised than he did in the past. If we're talking about a dog, perhaps this is a dog who goes on the furniture. In the presence of his owners, he suddenly begins to be punished for it. He will stop doing it when the owners are around, but when he thinks he is alone, he may do it even more than he had done previously. This of course could be prevented by crating him, or keeping him out of the room when nobody is there to watch him.
I'm going to pretty much ignore undesirable modeling, in which the organism being punished models the punishment (ie- child who is spanked for hitting his friends begins to hit other children back when they hit him), as I don't believe this applies to humans punishing dogs.
The other very potentially harmful side effect of punishment, is that punishment is generally negatively reinforcing for the person who is delivering the punishment. If the dog is barking, and a person delivers a shock, the barking stops. For the person who is annoyed by the barking, this temporary removal of barking can be very reinforcing. This is one that doesn't appear without explanation probably to be quite the danger it is, but it is an important danger to be aware of. Because the stimulus believed to be a punisher will temporarily stop the behavior, which is the reinforcer for the person delivering it, the person delivering it can be led to believe falsely that it is actually reducing the behavior. If you yell at the dog to stop barking, he will probably stop temporarily, probably just purely through being startled. If the dog does not receive attention for appropriate behavior, this may actually be increasing the behavior. The dog may learn that barking is a way to get some attention. The human believes it's better, because the dog is quiet as soon as he yells, however, the dog is also barking more often, and yelling is actually a reinforcer.
And here's a bit more of my opinion. If you are using an aversive, it's important that you take data. It would be pretty cruel to cause pain to an organism without being sure you are actually getting the desired effect.
I realize I haven't gone too far into when and why it might be justified. I will certainly discuss that a bit more later, and try to give some examples of these reasons for justification occurring. I felt it was important first that we just start with when it might be justified, and some of the issues you should be aware of when doing so. Thus, if you read this and never come back to it, you have what is in my opinion, the most important parts of the information.