The idea goats eat tin cans likely comes from a Warner Bros. Looney Tunes cartoon short from the 1930’s and/or 1940’s, though I can’t cite “chapter and verse” about which cartoon. If any.
Goats are inquisitive critters, and will nibble and chew on something new and unusual, just as a human would touch and feel something with their hands. Of a baby pops something into their mouth. So fast forward to a cartoon with goats eating cans and the myth is born.
There are “stories” Schulz eventually crafted Charlie Brown’s character after his own, with the experiences of growing up as a shy, nerdy and somewhat unpopular kid.
All the characters were different in the beginning, and somewhat bland other than early Charlie Brown, until Schulz figured out over time who the real core of kids were and their personalities.
Cats can’t digest dairy products well, so feeding a cat cheese except in very small doses is not a good idea. Lactose intolerant.