In my animal behavior class, I sometimes ask my 100 or so university students, who is smarter, dogs or cats? Usually about 75 people raise their hands for dogs, and about 25 raise their hands for cats.
Now there seems to be a little bit of scientific confirmation for this position. A recent article in the journal Animal Cognition (Whitt et al. Domestic cats (Felis catus) do not show causal understanding in a string-pulling task, DOI 10.1007/s10071-009-0228-x), shows that cats don’t do very well in pulling baited strings toward them. When there is one string with a tasty morsel on the end, the cats do pretty well. But when there are two stings, with only one of them attached to the tasty morsel, or when the strings are intertwined, the cats can’t seem to figure it out and pull strings at random, even when they can see each of the strings and see which one is baited.
This study follows on the heels of another that was published in 2005 in Animal Cognition (Osthaus et al. 2005. Dogs (Canis familiaris) fail to show understanding of means-end connections in a string-pulling task, Animal Cognition 8: 37-47) That study showed that dogs can do marginally better at string pulling. When there were two parallel strings, one of which was baited with a tasty morsel, and the dogs could see the strings, most of them could figure out which string to pull. However, when the strings were crossed, so that the dog had to pull the string that was opposite to the location of the tasty morsel, the dogs couldn’t figure it out and pulled strings at random.
So does this mean that dogs are smarter than cats? In my animal behavior class, I talk about the leash and food experiment. It goes something like this. Tie a dog’s leash down to a stake, and then loop it over another stake in a V fashion. Then offer the dog a bowl of food in front of the dog. The catch is that the leash is not long enough for the dog to go straight to the food. To get there, the dog has to back up away from the food, go around the stake at the point of the V, and then go to the food. Fewer than 10 percent of dogs can figure it out. Most keep pulling on the leash, trying to go forward to get to the food. And how about cats? Almost any cat can solve this problem.
The bottom line in the food leash experiment is that dogs and cats have a different ecological and evolutionary history. Dogs evolved on the open plains, where they chased their prey. If they got stuck in a bush, their best option was to push ahead until they got unstuck. Cats evolved in places where they spent part of their time in caves. If they got stuck in a cave, their best option was to back up and go around an obstacle. Pushing ahead inside a cave that gets narrower and narrower is a recipe for death by natural selection.
The interpretation of the string experiments is not as straightforward as it seems. Cats like to play with strings. They also get bored easily. In the string experiment, the cats were given a new string to pull every 10 seconds. My cat would have lost interest in the first 20 seconds. And dogs don’t normally go around pulling strings to get their food (although looking cute, hungry and appealing around feeding time could be considered pulling strings, heartstrings or guilt as the case may be).
So it may not be fair to conclude that these experiments tested the dogs’ or cats’ intelligence. To be fair to the authors of the studies, they recognize this as well, and list a series of possible confounding factors, including ecological and evolutionary differences between the two species.
The problem really is, how do you measure the intelligence of an animal? It’s not as easy as it seems on first glance.
And to that end, who really is smarter? When you consider that today in developed countries, many dogs and cats live a relative life of luxury, sleeping much of the day and being fed, petted, stroked, played with, talked to, and generally amused by their people, my answer is: they both are pretty smart. Many of us humans have to work to support our dogs and cats.
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