Can a male dog with one testicle breed successgully?

Yes, a male dog with one testicle, a condition known as cryptorchidism, can still breed successfully, provided the descended testicle is healthy and functional. However, there may be potential issues with fertility and genetic concerns, as cryptorchidism can be hereditary. It's advisable to consult a veterinarian for a thorough evaluation and to discuss any implications for breeding.