Are they both spayed/neutered? What bonding techniques are you using? Theyre not bonded if theyre still trying to figure out their hierarchy, so you shouldnt be leaving them together.

Kindof….they do have to work things out on their own and you should definitely redirect them if they start to show signs of an impending fight, but sometimes you also need to redirect them if one of the buns appears overly stressed.

Bonding isn’t just letting them play in the tub together and then in a larger space. They need to be gradually worked up to spending 48 hours+ together without any incidences before you can even think about having them live together. It starts with a 10 minute sessions and working your way up to that 48 hour mark, and they need to be under constant supervision the entire time. They aren’t bonded yet, and still need to be completely separate.

How long has it been since their spays? It can take a month or more for the hormones to dissipate, and it’s best not to start bonding while they may still be dealing with their hormones. In any case, it sounds like you need to slow down and you may need to separate them and start over with short bonding sessions, increasing the time period each day. Some humping is normal, but continued humping can be overwhelming and upsetting to the one on the receiving end. You don’t want Milkshake to get depressed, and you don’t want any fighting either.

It can take up to 6 months for females to drain their hormones. It sounds like the bonding was very rushed and they didnt establish a heirarchy. Keep them separate and go back to the beginning with short 10 minute sessions a few times a day, gradually increasing up to an hour, then 6 hours, then 12 hours, and all the way up to 48 hours. The problem with humping is that it can turn into chasing and fur pulling, which is bad. Bonding requires lots of patience and it takes time.

they’ll hump every now and then to re-establish dominance, but it won’t be an every day or week occurrence.

What are they like in sessions aside from the humping? I know they’re sisters, but bunnies don’t recognize family units. They are just another bunny in each others’ space.

Its good that they don’t fight, but do they groom each other when they’re together and sort of mirror each other and generally want to be near each other? Or do they more just do their own thing and sort of ignore each other? Just with the humping, its still better to just play it safe and keep them apart until you’re not really seeing it ever.

They’re unsafe due to causing gas and being a bit harder for a bunny to digest. I guess some people feed, but it just isn’t worth the risk of potential Stasis.

Even my 5 months+ bonded couple still humps and chases every now and then, thus I don’t agree that you should wait until you never see it again because you will probably keep seeing it. It’s just a way for the dominant to go “listen here you little $*&!, you’re still mine capiche?”

How often do they hump? If it’s 25% of the time or less I would keep them together permanently, they need to figure it out themselves and you mentioned them getting frustrated when not toghether. Frustration build up can lead to fights and they seem to enjoy each others company from what you wrote. Note that my opinion differs from the rest here, I prefer the once together leave together method whenever possible, which is also a very popular method to use!