I have been dealing with the same issue with Cooper and Bonnie! It is incredibly annoying but it is pretty common and I don’t think it’s a huge issue, as long as they go back to normal after.
With my two, I’ve opted to wait to lock them in until after the pellets are actually on the ground so they aren’t running around in the pen. I’m also careful to not feed them the pellets if they are actively circling or nipping. A little running around is OK but I want to make sure I’m not rewarding the aggression.
I also try to minimize the anticipation time, so they are a bit surprised when the pellets arrive. So I keep a canister near the pen and I unceremoniously but quickly scatter the pellets in their pen. They run in and then I close them in for the night. If they are running around chasing I just wait silently until they stop, then I feed.
If you find a system that works well for your buns please share! Coop has gotten better with this over time (I think with increased feelings of food security), so Nellie might get better as well once she realizes there will always be food for her.
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.