Heart-Wrenching Study Shows Why You Really Shouldn't Yell at Your Dog - Physics-Astronomy.org

Heart-Wrenching Study Shows Why You Really Shouldn't Yell at Your Dog

Your dog may be the apple of your eye, but let's be honest: she is an animal, with her own instincts and idiosyncrasies, and there are going to be times when she makes you want to tear your hair out.
However much you want to, however, new research suggests that you should never yell at or otherwise punish a mischievous mutt.




According to a study uploaded at the end of last year to pre-print server bioRxiv, aversive training such as positive punishment and negative reinforcement can have long-term negative effects on your dog's mental state.
"Our results show that companion dogs trained using aversive-based methods experienced poorer welfare as compared to companion dogs trained using reward-based methods, at both the short- and the long-term level," the researchers write in their paper.
"Specifically, dogs attending schools using aversive-based methods displayed more stress-related behaviours and body postures during training, higher elevations in cortisol levels after training, and were more 'pessimistic' in a cognitive bias task."
This sort of research has been conducted before, and found that aversive training has negative effects, but it's primarily been on police and laboratory dogs. In addition, the aversive training tends to be shock collar training, which is only one of several tools used.
So, led by biologist Ana Catarina Vieira de Castro of the Universidade do Porto in Portugal, the international team of researchers conducted their new study on companion dogs.
The animals were recruited from a number of training schools in Porto - 42 dogs from three schools that use reward-based training like food treats or play, and 50 dogs from four schools that use aversive-based training, such as yelling, physically manipulating the dog, or leash-jerking.


Each dog was filmed during the first 15 minutes of three training sessions, and saliva samples were taken to assess stress levels from training - three from each dog relaxing at home to establish baseline levels of stress hormone cortisol, and three from each dog after training.
The researchers also analysed the dogs' behaviour during training to look for stress behaviours, such as yawning, lip-licking, paw-raising and yelping.
Unsurprisingly, the dogs in the aversive training classes showed elevated stress behaviours, particularly yawning and lip-licking. Their saliva also had significantly increased levels of cortisol compared to when they were relaxing at home.
By contrast, the positive reinforcement dogs were pretty chill - far fewer stress behaviours, and much more normal cortisol levels.
The next step was to assess the longer term effects of this stress. A month after the dogs were assessed at training, 79 of them were then trained to associate a bowl on one side of a room with a sausage snack. If the bowl was on that side, it always held a delicious treat; if located on the other side, the bowl never had the treat. (All bowls were rubbed with sausage to ensure the smell didn't give the game away.)
Then, the researchers moved the bowls around the room to ambiguous locations to see how quickly the dogs would approach in search of the treat. Higher speed was interpreted to mean the dog was anticipating a mouthful of deliciousness, whereas a slower speed meant the dog was more pessimistic about the bowl's contents.
Sure enough, the more aversive training a dog had received, the more slowly it approached the bowl. Interestingly, dogs from the reward-based training group actually learnt the bowl location task faster than the aversive-training dogs.
This suggests that reward-based training may actually be more effective, although the researchers suggest this may be because the dogs already understand treat-based training methods. It's possible that the other group would learn more quickly were an aversive method applied - more research needs to be done to determine this.
Overall, though, the results seem to imply that aversive training doesn't necessarily have an edge over reward training, and that reward training is much better for your dog's happiness.


"Critically," the researchers said, "our study points to the fact that the welfare of companion dogs trained with aversive-based methods appears to be at risk."
The full paper is available on bioRxiv ahead of peer review.
A version of this article was first published in November 2019.

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