Hi, everyone. We've had our boy for about a month and a half, and he's very sweet and laid back. We crate him while we're at work, and we've had the same dog walker coming since Day 1. Within the last week, he's started growling at her when she approaches his crate. He has been totally fine with her and was always excited to see her (we have a camera). A friend let him out of his crate last night and brought him to her house because we had a nighttime engagement, and he showed no signs of aggression. He's never growled at anyone else, and he's recently had a checkup at the vet. No other changes in medication or diet as well. I had her come two days while I was working from home to walk him, and he seemed okay. The dog walker seems very sweet and came highly recommended. Has anyone else experienced this?