Ooh - sorry, I seem to have got alarm bells ringing.
Firstly, (and only my opinion) but sending Susan back? That's going to be about as popular on here as leaving a rude smell in an elevator. :lol:
You see, we ALL love Susan and she is clearly at home with you and, just my opinion, but you are doing the right thing having her there. She's got a forever home and, in time, I do believe she will be fine with Dilly.
Dillon to me, seems used to his routine - visiting dogs, builders, children. These are all familiar to his world and what he associates with routine. But his life in some ways has been turned completely upside down. And (and I was thinking about this as I was watching Henry earlier), Dillon can't speak to you and you him. So you can't tell him what you are doing is trying to rebalance his life. All he hears in his world is "blah blah blah blah" and his life has changed. His routine has changed.
Like humans, rabbits are emotional and complicated. They have different personalities and deal with situations differently - in my opinion.
It may be, that Dillon's world was stable and he liked that. Rabbits, evidentially, like routine. That changed and he doesn't know how to react. Perhaps his brain chemicals have gone into overload and causing an inbalance within his body that he can't control and neither can you. Thing is, you can't reverse time - as much as you (and for that matter most of us) would wish to do.
Problem is, is this plausable or am I just off my rocker? And if it's plausible, how can the situation be resolved.
For me, and not the best answer, but time can be the best healer, but rightly Dillon has ongoing medical problems to attend to. Isoltaing him probably isn't going to serve well because he will be used to companionship even if it is with wires in between. This was what I was pondering with Henry earlier. Watching him. I felt so sad that he can't sit with Lillian and 'communicate' with her about what he's just been doing (zooming upstairs and playing games with himself). He just sits there with Lillian in a quiet rabbit world. No verbal signals, nothing. So in essence they live in silence and yet they have to communicate in some way. I just wished Henry could sit and somehow tell Lillian just how much fun he's just had.
There are some stress remidies that you can get - plug ins and sprays that can be used.
I don't know - I wish I had an answer that could help you , I really do. But since the test results seem to be inconclusive, maybe it's worth chucking this theory round at the vet and see what their reaction is?
I'm sorry I can't help more. Dilly is such a lovely bun and I feel deep down he is just trying to deal with changes he doesn't understand and you just want to be able to tell him everything is ok.