look my dog listens to me all the time, except with cats. expecially when he is not on a chaine. when see sits in the garden, and the cats are near the fence, eh goes crazy, thenhe doesnt listen, or sees the treat. its like he forgets about everything, and just wants to grab the cat.
In many dogs the instinct to hunt is huge. Hunting dogs will usually see cats as prey or a threat. I have seen dogs just tear into cats right away. I would not let your dog get near cats cause you are right he will probally kill it. What usually happens is the dog comes up hard at the cat, the cat swipes at the dog and then its on. usually ends with the cat in the dogs mouth being shaken to death. Im sure this instinct is very strong in many dogs I have seen it first hand. Might be the cannine trait to hunt and protect. Not all dogs seem to have these or other typical traits, I have seen Labs who could care less about retreiving, pointers who dont point or hunt. BUT there are other labs and pointers who do that stuff like their lives depend on it. For the record Im anti-hunting.
With that said I did see The Dog Whisperer guy, Ceasar M. Teach a dog who wanted to tear up a pet rabbit to be nice to it, so maybe with the right training this can be controlled to some degree?
Must be where the saying "Fighting like cats and dogs" came from.