[Altariel]

Indeed, which is why, in that series, the terminators would kill dogs that 'alerted" the human resistance to their presence.

For instance, one of the tip offs that the T-1000 is the "bad Terminator" is that it kills John Connor's dog.

[TexasTransplant]

When I was growing up we had a German Shepard that was just the biggest playful lug of a pup with just about everyone... except with a couple of people (un-related in any way) that no matter what we said... quiet... settle down etc... he would growl bare his teeth, get between us and the person and be aggressive when ever either one of them were around... he was years ahead of their future ... they were proved to be no good.

All in all it says something good about people, in all of his 11 years there were only 2 people that Rex didn’t like.

TT