Oh boy, our new guy (5 months old) eats like he has never eaten before and like he will never eat again at every feeding! We have a large pen that we put him in at feeding time and our older guy (1.5 year old) eats outside the pen. If we didn't separate them, our older guy would never get to eat. I don't even know if the little guy chews...we should have named him Hoover!
When I give treats, the older guy likes to play with it and savor the treat before finishing it. The little guy just inhales it and runs toward the big guy to grab his, and he has successfully gotten many! I have to hold him back so the other one can enjoy his treats!