Why does my dog hate certain dogs are often referred to as man’s best friend, but when it comes to their relationships with other dogs, things can get complicated. If you’ve ever found your-self wondering, “Why does my dog hate certain dogs?” you’re not alone. Many dog owners struggle to understand why their furry friend gets along with some dogs but seems to despise others. The truth is, that canine social dynamics are complex and influenced by a variety of factors, including breed tendencies, past experiences, socialization, and even body language.