Wednesday, 31 July 2013

The Importance of Food in Dog Training

Studies show dogs respond better to training when the reward is food.

Golden Retriever thinking about a bone

It goes without saying that food is vitally important and also one of life’s luxuries. Many people routinely use food such as chicken or treats to train their dogs, while others are offended by the idea and think their dog should obey commands for praise or affection. Who is right?

Several scientists have looked at this topic recently. Last year we reported on a study by Erica Feuerbacher and Clive Wynne that compared the use of a food reward to petting and praise in training. In a series of five studies, they looked at dogs that have owners, dogs that are in shelters (and hence potentially deprived of affection and petting), and hand-reared wolves. Amongst all three groups, food was a better motivator than petting and praise.

One of the striking things about comments on this story was that some people seemed to confuse food and love; they felt that if your dog wanted food then it didn’t love you, or didn’t love you enough. But food and love aren’t mutually exclusive; just because a dog loves sausage doesn’t mean they don’t also love their family.

In fact, Yuta Okamoto and colleagues in Japan suggest that using the right reinforcement in training will ultimately lead to a better relationship with your dog.  

Maybe some dogs are more interested in food than others. You know how some dogs wolf down their food, while others are slower eaters? Okamoto et al took a group of 34 dogs that lived in a kennel environment. They divided them into those who did not finish a bowl of food and had leftovers, slow eaters who took their time to finish it, and fast eaters who finished it quickly. 

Then they put the dogs to work, asking them to ‘sit’ every 5 seconds for three 5 minute periods, each time with a short break in between. They gave a food reward every time the dog sat. Then, for another set of three sessions, instead of using food, the handler said “good” and stroked the dog if it sat as requested. 

The dogs in the Fast group responded well to food as a reinforcement, and when the handler switched to praise and petting the rate of response began to drop off substantially. The group of Slow eaters, on the other hand, did maintain a good set of responses when the reward was changed to praise and petting. Finally, the Leftover group was not particularly motivated by either food or praise and petting.

However, although there were differences between the three groups, all of the dogs had a better response when food was used as a reward compared to praise and petting. So this study suggests that although there may be individual differences in how motivated dogs are by food, they are still all motivated by food. 

While these two studies combined praise and petting, a new paper by Megumi Fukuzawa and Naomi Hayashi compared food to praise (“Good boy/girl”) or petting. Fifteen dogs took part; six were pet dogs and nine lived at the university.

They were first given some basic training in a sit/stay. For the experiment, the dogs were divided into three groups according to the type of reinforcement used, and trained to “come” using a standardized plan that had four stages. Only once a dog had completed a stage with 75% of trials correct could it move on to the next stage.

Dogs came significantly faster when called if they were trained using food, compared to either praise or petting. In terms of the number of trials needed during the main training, there were fewer differences in reward types. 

Interestingly, during the baseline training on sit/stay, which used the same reward as for the experiment, dogs in the food group needed fewer trials than those in the other two groups. The authors suggest that the reward type is most important for the early training sessions. 

The design of this study utilized a training plan with progression once the dog reached a 75% success rate. The dogs required significantly more sessions to reach the criterion during the first distance of 1m, compared to the following trials at 2m, 3m and 4m. In other words, the later stages of training were easier. 

The authors say that “in training that used 3 types of reinforcement – food, stroking and praise – it was food that shortened the time taken to complete the response to the command. However, this difference occurred only in the early training stages and not later in the training process.”

One proviso for all of these studies is that the number of participants is very small. It would be better to use larger numbers of dogs, especially since there are many different breeds and dogs come into the studies with different histories of being trained (or not). In research with human participants, there are guidelines about how many people should take part and perhaps canine scientists should also begin to use such guidelines in future research. 

However, it is very interesting to note that even with such small numbers of dogs (and wolves) there is a clear preference for food as reinforcement in all three studies. Therefore it makes sense to use food in training.

What kind of food is the best motivator for your dog?

P.S. Make your dog happy: train force free and do dogs get that Eureka! feeling?

Feuerbacher E N, & Wynne C D L (2012). Relative efficacy of human social interaction and food as reinforcers for domestic dogs and hand-reared wolves Journal of the Experimental Analysis of Behavior, 98, 105-129 DOI: 10.1901/jeab.2012.98-105  
Fukuzawa, M., & Hayashi, N. (2013). Comparison of 3 different reinforcements of learning in dogs (Canis familiaris) Journal of Veterinary Behavior, 8, 221-224 DOI: 10.1016/j.jveb.2013.04.067  
Okamoto Y, Ohtani N, Uchiyama H, & Ohta M (2009). The feeding behavior of dogs correlates with their responses to commands. The Journal of veterinary medical science / the Japanese Society of Veterinary Science, 71 (12), 1617-21 PMID: 20046029

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