Indoor marking is a common behavior issue in dogs, especially in unneutered males. Here are some tips to help stop your dog from marking indoors: 1. Neuter or spay your dog: This can reduce the urge to mark. 2. Clean up accidents thoroughly: Use an enzymatic cleaner to remove the scent of previous marks. 3. Supervise your dog: Keep an eye on your dog and redirect him if you see him about to mark. 4. Use positive reinforcement: Reward your dog for good behavior and provide plenty of opportunities for outdoor bathroom breaks. 5. Consider crate training: When you can't supervise your dog, confine him in a crate to prevent marking. 6. Consult a professional: If the issue persists, seek help from a professional dog trainer or behaviorist.

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Topics covered in this question:

Dog Behavior House Training Positive Reinforcement Neutering Indoor Marking