How do stop my little dog from biting other dogs when playing?

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I’d advise you to take that biting very seriously. It doesn’t matter that she’s little, or that she usually gets along with others.Seriously, all your little dog needs to do is injure the wrong being (human, dog or other) once and Animal control can be called out to assess the temperament, impose a quarantine, and possibly result in the early euthanization of your little dog’s life. If your dog has been exhibiting this in the house, it’s not a far stretch to say that without changing the behavior your dog may become a menace in the neighborhood, attacking other dogs or humans during walks or if you were ever to have a sitter watch or walk.

Look for a trainer who offers positive reinforcement training techniques. I’d suggest that you can interview people if you’re going to have a trainer and let them know that there is this one behavior that you need to fix first most importantly and make sure that they are confident when they tell you that they can help you fix it, which will require training sessions and reinforcement homework/ at home sessions daily in between. You can also look up positive reinforcement videos on YouTube. One renowned trainer of England, who had success with training tough cases is Victoria Stillwell