Here’s a question that never occurred to me before- why are there big cats, but no big dogs? At one time, there was a very big canid ancestor, but it wasn’t Clifford the Big Red Dog, and that one’s extinct anyway. While there are wild canine species left that differ from our human-bred domestic dogs, the biggest of them top out at about 175 pounds. Meanwhile, adult male tigers can easily weigh 600 pounds!
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This video explains that the difference is in an animal’s hunting strategy. Dogs are pack animals, and almost all cats are solitary ambush predators (the lion being an outlier). The size of the cat has to do with its preferred prey, which varies widely from house cats chasing mice to tigers taking down water buffalo. A dog’s size matters less when they have an army of relatives hunting with them. The difference in hunting strategies also explains quite a few other differences between cat and dog anatomy, from their teeth to their shoulder articulation.