when i was stationed in san diego naval hospital, i would often walk across the street and watch them feed the large cats. 2 seconds of a brawl between a gsd and a "cat', and the gsd is done for. heck, i recently saw a bear turn and swat a pit bull mix, one swat with the razor sharp claws disemboweled this 70 pound dog who died on the spot. gsd are amazing dogs, but they have their limits. now if this was a declawed toothless old jaguar, then i could see it.