My, I found that rather beautiful yet saddening. Thank you for sharing, I really enjoyed the animation.
As for the meaning of the video, I'm not entirely sure but I picked up a couple of things from both the animation and the lyrics. I think really it's about instinct and protection (or maybe overprotection). The wolf didn't realise his actions until the rabbit got hurt and it was too late. In the end he's done too much damage and he couldn't fix his mistakes.
So like how you said, Doctor Flob, the rabbit could be friend or partner that was hurt unintentionally due to an overprotective person perhaps? The wolf hurt the someone or something that he was trying to protect.
I'm not too sure but that's kinda how I see it ^^"