Hi there,
So sorry for your loss of Parsnip.
There are many here with two males, so it is possible, but like all bonds, depends on the personalities. It does sound like the last session had a pretty bad fight (rolling around together…). Did anyone get injured (skin broken)??
I would first take another break of a few weeks as kind of a reset to allow them to settle down, and start doing the cage swaps during that time (every day or two). Even though it feels unfair for Radish, it’s important for them to lose track of what is “their” territory, and to start the process on an even playing field. If you really don’t want to swap cages, at least swap litter boxes (but I think cage swapping is more effective).
Also, I’m sure Mushroom would love more space! He might be used to a small hutch, but that doesn’t mean he’s as happy as he could be…. do you at least allow him several hours in a run each day?
That aside, here is the approach I would take (assuming no one was injured in the fight):
-Pre-bond + break from sessions for 3-4 weeks
– When you are ready to start sessions again, work with a larger area in very neutral space. About 10-15 ft should be good. This space should not have any food, litter boxes, or hiding boxes. You don’t want anyone to feel trapped or get possessive over anything. Also if someone is in a hiding box you won’t be able to read their body language. You want them to have enough space to get away from each other if they want to. The rescue might even allow you to bring both bunnies in and date them in their exercise pens (my rescue did this, it’s always worth asking). Then they can also help you with bonding.
– Start with very short sessions (30 sec – 1 minute). Whatever the minimum is to insure that they will not fight with each other. Basically you will be giving them time to explore the area and then end the date. If the immediately lunge at each other, you will need to re-think things. You can try taking them on a car-ride together (place both bunnies in a bin or box, have a helper drive, and you make sure they don’t fight). Car rides were really the thing that helped with my first bond (which was very difficult). It is very very important that you do not let them fight. Set short time goals for each date, and don’t extend the date just because things are going well. Be very aware of their body language. Ears back and tail up means they are going to lunge or attack. If they approach each other, it can be very good at this stage to pet them both and swap scents, then end the date.
If stressing is not effective, and even short sessions aren’t possible, they may not be a good match. If you have the ability to keep two pairs separately, it might be best for both of them to take them both dating and find a new mate for each of them.
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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.