putting my dogs in a penned play yard

The dogs are unfettered in this pen It’s big enough for an army of a hundred and ten No one has to wear a leash or be tied The yard is long, the pen is wide Still, I feel guilty leaving them here Why this is, is in no way clear They are safe here, they cannot chase cars Yet leaving them here gives me anguish and scars I have no idea why I feel this way But I sit in the pen with them every day This silly guilt I probably should not have Yet I sit here, stone-faced, feeling bad.