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I have two dogs and one is just gun shy regardless of what it is or how its presented (have had him since he was weeks old), the other goes gunning with me and the only time he get weird is when I practice draws that are too close to him.

To add response to the OP's questions, the action of you drawing itself might not of triggered it, but the drawing might have changed your posture and body language just enough that the dog was able read your body and know you are challenging back. Think of it as if you puffed up your chest or showed your teeth, the body language can tell the animal so much.

I many cases having a gun, or drawing a gun makes most wielders stand firmer or more confident whether or not its a motcho thing about us or just natural sense of security.