Sorry to hear that pete you get attached to them so easily , and it really pulls heart strings when there so vulnerable and get ill, gotta fight for him if he isnt suffering though.
we used to have another kitten called jericho before leo and houdi who they replaced he was boos brother ,we found out he had spinabifda after 6 months and we just couldnt bear to put him down, we fought like crazy but wasnt to be eventually his heart gave up on him and he left us. I wonder sometimes if i should have let nature take its course but when you love em its hard.
Houdini is a savanha hes still a young un 8 months old Boos bout 18 months and leonidas is couple weeks younger
i hope the little one pulls thru pete