That's adorable!!! LOL. I understand what you mean about vicious....my cat and dog play fight like that. Both of them love it, but my cat yowls and hisses and Sully drags her around by her ears. She loves it! When she gets tired of his shananigans, she'll jump up on something he cant reach. But until then, they're better than any tv show!
That's great that Tucker has such a fun playmate.