While in an RV park, I was walking my dog, on leash. A woman on a bike approached with an unleashed dog. She asked if my dog was friendly, I said yes. She replied hers was too...then her dog attacked mine.
I drew my .380, using trigger discipline but she rushed to get her aggressive mutt.
I didn't say a word and kept walking.
My after action assessment was I erred.
Not only were the dogs movements too fast, I was in an RV PARK! No clear shot!
A belly gun is difficult at best, to hit what you're aiming at.

Good luck!