Diet Diet Help for a Young Boar Living with a Mature Boar

[TeddyandOatmeal]

Hi everyone, this is my first post on the forum! I'm adopting Oatmeal, a young boar who'll be about a month old once he's home, and he'll be housed with my piggy, Teddy. Teddy was said by a vet to be between the ages of adolescent and elder, and he's a bit greedy. I'm unsure of how to give Oatmeal his extra calcium such as alfalfa hay and parsley without Teddy getting some too. I'm also not sure how to make sure that Teddy doesn't eat the young guinea pig pellets from Oatmeal's bowl. Any help would be much appreciated!