The answer is yes. Dogs suffer from many mental health issues, such as anxiety and depression. Although these symptoms can vary from dog to dog, the cause of most mental illness in dogs is often due to being bred for a specific purpose or because of a medical condition that’s left untreated. For example, poodles can develop deafness, which causes them to suffer from hearing loss. Because they don’t hear loud noises like humans do, these dogs are more likely to suffer from anxiety.