system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do cats smell good even if they've never been bathed? Dogs lick themselves too, but they generally need to be washed or else they get smelly.
gpt
Dogs are pack animals, so they are concerned with communicating with each other. The easiest way they communicate is through their super sensitive noses, and through sniffing and smelling they can talk to each other. Though dogs only really sweat from their noses and paws, each hair follicle has a special sweat gland. It is speculated that this gives each dog an unique scent that only a dogs special nose can pick up. Another gland that gives off an unique scent is their anal glands. It's why dogs like sniffing other dogs' butts. These glands give smells as unique as our names; a dog identifies another dog through their odor. But as humans, we don't have the same smelling talents as dogs, so we only distinguish the musky, dog odor. Also, it doesn't help that dogs love rolling in stinky stuff. It helps mask their natural odor from other animals which they hunt or try to avoid.

Though cats can sniff things out better than we can, they aren't as concerned with sniffing out and becoming friends with other cats. They are a more lonesome creatures, and thus haven't evolved to have super obvious and unique body odors. Instead, it is more important for a cat to be stealthy. They are smaller, and have many more predators than your average wild dogs have. That is one reason why cats are so finicky about grooming. They are trying to keep clean and odor free in order not to attract bigger animals that could possibly eat them, and to hide from the more aggressive cats. Their tongue is specially designed to remove dirt and other particles that might lead to odor. Keep in mind, male tomcats can develop a thick, musky scent from their anal glands. That is because they are the biggest, toughest cats around and it helps intimidate other kitties from approaching them or their territory.

Diet is also a factor. Dogs eat almost anything, including trash and dead animals, and it can give them an unique bouquet of odors coming from their mouth and butt. Cats have a very restricted diet, which their body handles very well, and it helps limit their odor.