That can work in the opposite direction I had a Rotty that had bit a few times for little reason quick go away bites to most anybody she was a scary dog who would growling and bark like a freak but still social and forward in public, you just had to be careful of quick movement and people hugging her in the house. I took her to a club when she was 4.5 and had live bites on the sleeve she looked perfect but was to defensive to bite well for sport but she had gained enough confidence to not react to little things and never bite anybody else in the next 4.5 years she lived so it cured my dogs fear biting for no real reason it made her happier and safer she realized they actually had to be a real threat to get bit.