Sorry I’m a little confused, are you currently working on bonding them? And is the girl spayed?

Any new bun in the house can trigger crazy behaviors from your current bunny. Digging can be a territorial thing, so that could very well be it. If they girl is unspayed, that would make matters even more crazy.

If you are bonding them, they should only be allowed to interact in neutral territory, and should not be able to touch each other through the fence (they can nip unexpectedly and start developing grudges). First step is to make sure the girl is spayed, then start with pre-bonding, which means 3-4 weeks of cage swaps. This will help them loose track of their territory. Then you can start “dating” them in neutral territory. When you are bonding, litter box habits go out the window, but should return once they are bonded.

If you aren’t planning to bond them, you shouldn’t be letting them play together at all, and they should not be allowed into each other’s cages. They know there is an intruder, so it will make them more territorial.

Hi,
It is strongly advised to not let a unspayed female and a neutered male be in the same area as eachother until both are fixed. One could start a fight and could cause a huge grudge to be held that might prohibit bonding. They might show loving signs towards eachother but you can’t start the bonding process until she is spayed. It will be a different ball game when she is spayed because right now, she is acting loving towards him because she is reaching that age of having babies.
My male will dig in his litter box when he sees one of my other buns (not in his bonded relationship) which indicated territorial behavior and anger. You can let the two see eachother through the bars and far enough away from eachother to prevent nipping because they have razor sharp teeth. After she is spayed for a month you can start prebonding. Prebonding is always recommended so you can ensure a strong bond will be made. I suggest reading about bonding in the bunny info section of this website

If she is not old enough to bond yet (and she isn’t, since she’s a baby), then don’t let them interact. Babies generally get along with adults, but once hormones kick in fights can break out out of nowhere. Any sorts of aggression can really set things back, so it’s not worth the risk.

The pre-bonding (cage swaps) is great, and should continue, but no more play dates until you start actually bonding them. And then all interaction needs to be in neutral space.