At Baxter’s K9 Complex in St. Charles, Mo., your dog will sleep well after playing with fellow canines at this 15,000-square-foot indoor-outdoor play park that includes ramps, jumps, tunnels and toys. The space is so big, however, that if your pup poops out, there is still plenty of space to chill out for a little while. Drop off your pet, or hang out to watch him play with his favorite pals.