Odd behavior towards one person
I have a neighbor who stops by every once in a while who Traveler doesn't like.
About a month ago my neighbor came over to my house and I introduced her to Traveler. Trav acted as he normally does when meeting new people and, once he realized he wasn’t getting a treat, wandered off to lay down in the living room. We went into the kitchen to get some lemonade and Trav followed us (which is his usual behavior - I keep his treats in the kitchen). We ended up talking in the kitchen and about 10 minutes later, Trav started snarling at her. I quickly put a leash on Trav and led him to another room, shutting the door to the kitchen. He didn't resist the leash or being moved into another room although it did take him a few minutes to settle down/stop barking. My neighbor visited again yesterday and Trav started aggressively barking once she was in the driveway. We ended up talking outside on the patio with Trav barking inside for a few minutes. Later in the day some other people visited and he was his normal, laid-back self.
This friend does have chickens and I'm wondering if this is why he doesn't like/trust her. Before I adopted Trav, he had been adopted as a guardian dog by a woman with turkeys. He failed miserably, killing a few turkeys (he was about a year old at that time, too young to be guarding livestock by himself) and the woman just opened the gate and let him wander away. Luckily he was chipped and a local vet was able to contact the rescue group who placed him. I adopted him a few months later (July 2010).
Trav loves going on his daily walks and is great on a leash, has a decent number of families who greet him, and is indifferent when meeting new people and other dogs. He's a pyr so he does bark at everything, but normally settles down once I acknowledge it. No change in his health and has been to the vet recently.
What should I do about Trav's behavior towards my neighbor? Growing up we had dogs that just didn't like one person (usually a trapper or hunter) and we assumed it was a scent that the dog wasn't comfortable with and just kept the dog away from that person.
I'd appreciate any advice!