Bacterial Folliculitis Dogs. It can be caused by bacteria or yeast getting into the follicle but it may also signal an underlying problem with the dog's immune system or a skin disorder. Animal wellness magazine points out that bacterial infection is by far the most common cause of folliculitis in dogs.
However, fungal infections, trauma to the skin, parasitic infestations (like fleas or mites), and systemic diseases can also trigger cases of folliculitis. A proper diagnosis will allow you to figure out the correct treatment. Many people wonder if folliculitis in dogs is contagious to humans.