I told him it was probably a generic email but he said that he doesn't care if it was generic or not, he "doesn't want Rover telling him about his dog when they don't know his dog."

I take care of a beautiful shepherd mix about once a month, I am on great terms with the owner and I have never had any issues or concerns with the dog. Yesterday, the owner told me that he received an email from Rover "telling him how to handle his dogs bad behavior." To put it lightly, he was not pleased at all with this email and said that he deleted his Rover profile and has asked all of his friends to do the same. He wants to continue using me and said that he has no idea why he got the email. I asked if he had replied to it and he said that he didn't have "time to waste with idiots that don't know his dog."

Has anyone had anything like this happen before? How should I handle a situation like this?