If house cats could grow to the size of some bigger dogs

Well there are big cats like tigers and jaguars and such. House cats are weird and skittish though. A really big house cat would probably act similar.

I think my romeo would let me use him as transport lol. Id be like take me to work boyo 🙀

There are bigger ones. Savannah cats can range from 9.9 lbs to 24.25 lbs.