There are plenty of fun indoor activities to keep your dog entertained and mentally stimulated. Here are some ideas:
1. Hide and Seek: Hide treats or toys around the house for your dog to find.
2. Indoor Fetch: Use a soft toy or ball to play fetch indoors.
3. Puzzle Toys: Invest in puzzle toys that challenge your dog to work for treats.
4. Training Sessions: Teach your dog new tricks or reinforce basic obedience commands.
5. Tug-of-War: Play a gentle game of tug-of-war with your dog using a rope toy.
6. Interactive Games: Play interactive games like 'find the treat' or 'shell game' with your dog.
7. DIY Agility Course: Create a mini agility course using household items for your dog to navigate.
Remember to always supervise your dog during these activities and adjust them according to your dog's age, size, and energy level.

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Topics covered in this question:

Dog Training Mental Stimulation Dog Enrichment Indoor Activities