system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do horses and cows never share the same pasture or enclosure?

It seems to me it should not pose a problem since both are herbivores and so I guess would leave each other alone.
gpt
Horses don't graze in quite the same way that cows do, in general cows just bite the top of grass, horses eat all of the grass except that which is close to manure which horses avoid eating near. In addition some diseases can spread from cattle to horses and some medication given to cows in their feed can be deadly to horses.