Why do intact (male) cats stink but intact (male) dogs don't? Do all intact felines stink?
Hi! @release-the-hound here!
One way cats communicate with each other is via smell. Cats have scent glands on their cheeks, chin, top of head, and base of tail. These glands emit pheromones that stay behind on surfaces. Cats rub against items to mark their territory, and against people or other cats to signify acceptance into the cats social group.
Intact male cats are very preoccupied with marking things (this is also why they spray urine). They use it to signal their territory to other male cats (sort of a smelly "keep out!" sign). But the main reason they're stinkier than neutered male cats is because they also have hormones to signal their reproductive fitness to female cats (like a very smelly tinder profile).
While scent is also important for inter-dog communication, they don't have scent glands on their faces (hence why they don't exhibit face-rubbing while cats do). Their scent glands are known as "anal glands" and typically they're only expressed when a dog poops.
TLDR: intact male cats are stinky because they have more scent glands and they mark more than intact male dogs.