Vengeful Cat Chases Proud Dog

I thought the old commonly held belief was that dogs took advantage of the weaker, smaller cat.
This video must be part of the Myth busters series or something, because boy did it prove that cats might actually have an upper hand and not the other way around! The start of the clip shows dog number one and cat number one peacefully exchanging greetings. But everything heats up when dog number two sprints (or runs/gallops, whatever term is used for house pets) towards cat number two, souring the whole affair in an attempt to scare the cat off.

Whatever peace was maintained disappeared in a matter of seconds, as cat number one chases after dog two to avenge its fallen compatriot.

Dog two actually panics and runs away, but cat number one is relentless and pursues him all the way out to the street! Everyone is left cracking up in this unexpected turn of events. I guess cats are just super territorial and will chase another pet off even if it is bigger and stronger.