[SWHouston]

Here I go psychoanalyzing things again, but, Maximo brought up a very good point !

1) How many Yorkies do you know that like bigger dogs.
2) Cowgirlc was acting strangely (running/rushing) possibly verbalizing.
3) Cowgirlc was moving toward an area of danger possibly (his opinion).
4) Gismo is confused, inexperienced in communicating.
5) Gismo does not know how to stop Cowgirlc.
6) Gismo only knows one way to hold on to something (bite).

I think he was in his "Protection" mode, and just didn't handle it too well.
The bite was only to capture/stop Cowgirlc, just badly executed.

I'm not trying to excuse anything here, just give MHO.