To help a dog overcome separation anxiety, it's important to gradually desensitize them to being alone by practicing short departures and gradually increasing the time you're away. Providing them with interactive toys or puzzles can also help keep them occupied while you're gone. Additionally, creating a safe and comfortable space for your dog with familiar items like their bed or blankets can help reduce their anxiety. Consistency, patience, and positive reinforcement are key in helping a dog overcome separation anxiety.