“if goofy is a dog and pluto is a dog why is one a pet” is the cartoon equivalent of “if man evolved from monkeys why are there still monkeys”
The implication that Goofy is just a more advanced stage in canine evolution is oddly terrifying somehow
theres no such thing as ‘more advance’ in evolution. a dogman isnt more evolved than a dog, just as you are no more evolved than an seagull or coral, they are just fitted for different environments and have evolved as such
Goofy is not more evolved the Pluto, Goofy just fills a different ecological niche. While Pluto is just a scavenger and Goofy is an apex predator both play important roles in the ecosystem.