Best Outdoor Kennel Flooring Options?

Hey folks,

I’m in the process of setting up an outdoor kennel area for my 4-year-old Lab mix, Rocky. He’s a big fan of hanging out in the yard, but he also has a talent for turning everything into a muddy mess especially after it rains.

I’m looking for practical flooring ideas that are durable, easy to clean, and comfortable for him to walk on. Concrete? Gravel? Some kind of artificial turf? I’m open to suggestions. Bonus points if it can handle a dog who loves to dig and roll around!

Thanks in advance for the advice.

Dave