My oldest cocker, Daisy, took a nap in a baby playpen every day for her first 18 months of life. I'd put her down at 11 AM and go back in to get her around 2 PM. She would be sitting there patiently waiting for me to get her up and take her outside to go potty. I'd turn on the weather channel on the TV for white noice and shut the bedroom door. At about 18 months one day we put her down and she met me in the kitchen (she'd jumped out of bed run out the bedroom doggie door and in the other doggie door).. put her down again and she repeated... so we said well, she's done with her naps and that was that. But she has always been the sweetest and calmest dog ever. We tried with Missie and she wasn't having any of that nap stuff.. just like kids, every dog is different.