Walking after Rain

My Takumi hates walking after rain when the ground is still wet. He's been like this since he was a puppy. It's been raining here in Miami since last night. I tried to take him outside when the rain stopped and managed to make him pee, but he hasn't pooped for 24hrs now! He shakes himself off as soon as we get in the house, as if he had been walking in the rain, which is not true!!
Is this only my dog?

[mod edit: changed category]