All it is gonna take is one of those bears to fall on top of one of those dogs for that guy to realize that it isn't so cute and fun.

What happens when they actually fight? Are the cracker shells going to stop the polar bear from tearing one of those dogs' heads off? All animals are tame and nice until something triggers a reaction with an animal. I remember a kid had a pet lion in India and everyone was laying around the lion and when the kid got up he stumbled and fell on the lion and the lion attacked him ( only for about a second ) and then it stopped.

One of those polar bears is going to kill one of those dogs, its inevitable.

The dog is like, "Stop hugging me. I hate it." And the bear is like, "No, you like it." and then he sticks the entire dog's head in his mouth! This interspecies thing is not natural ;)