>I have diluted it 1 part hibiscrub to 5 parts water
No, that's much too strong for bathing something like this - you want the water to be only faintly pink, so dilute 1 part Hibi to about
50 parts water! Hibiscrub stings in open wounds!
Alternatively dissolve a teaspoon of salt in a pint of water for keeping it clean.
Our old lab used to rip her dewclaws like this; they were the only times she ever cried in pain. Every time she moved it seemed to catch on something and hurt her, so go very gently with it today. The vet will probably be able to quickly pull it off without sedative being needed.