Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to get a puppy to sleep [title] Make sure they get plenty of play time. [step] Because puppies are growing, they need at least 17 hours of sleep per day. This means that your puppy will be napping a lot throughout the day.

Ending1: However, you can control when your puppy sleeps by developing a routine. Limit your puppy's naps to the morning, middle of the day, and the afternoon. Ending2: Even if they're sleeping on their back, they still need around 16 hours of playtime every day. Make sure that they get at least 6 hours of play time every day, or longer for longer periods of time. Ending3: Try to train your dog by playing games designed to prevent boredom. [substeps] Give your puppies toys of different shapes and sizes. Ending4: Puppies tend to sleep longer than other dogs. [substeps] Treats are a good way to provide treats throughout the day.

Answer format: ending1/ending2/ending3/ending4