Hi, everyone - I have a 6 year old male Chihuahua/Dachshund mix named Beckham. I adopted him from a shelter 18 months ago and he has been my sidekick ever since. I love him to pieces. He is a great watch dog and gets along well with other dogs. The issue I am having with him is his EXCESSIVE barking when men come around, my boyfriend in particular. Since the first day the two met, Beckham has barked excessively at him. He does not let him pet him or get close to him. Beckham will literally bark for almost the entire time my boyfriend is visiting. He usually stops barking for a few minutes and will get a drink of water or jump up on the couch with us but then starts barking again. I've tried holding him, petting him, telling him it's ok, everything. The barking does not stop. While I'm holding him, I can feel his heart beating fast and he sometimes begins panting like he is out of breath. I've noticed that if my boyfriend stands up or moves closer to Beckham, he will flinch and back off but continues barking. Recently, I was at my sister's house and a male friend came over. Beckham started the excessive barking again and would not calm down. Another time, I took him to the dog park and there was a man who walked by us. Once again, Beckham began barking like crazy. However, he does not bark at my brother or uncle. He also does not bark at the vet, even though the vet is a male. I also took him to my cousin's house and he did not bark at her husband. I live in an apartment and encounter my neighbors quite often while walking Beckham around the complex. He does not bark at any of the males. Unfortunately, I do not know much about his background or where he came from. All the shelter told me was that he was on the street and someone took him to the shelter. I wonder if he was possibly abused in the past by a male. But then I still wonder why he only barks at some men but not others. It is frustrating because I want my boyfriend to feel comfortable when he comes over. I want Beckham to feel comfortable around my boyfriend too. My boyfriend treats me well and I want Beckham to know that he is not a threat. We do not argue or yell or anything that would possibly trigger Beckham. My boyfriend is calm during all the barking but I can tell that it bothers him. I am considering taking Beckham to a dog trainer who can help get to the bottom of this and find a solution. Any advice would be greatly appreciated. Thank you everyone for reading.