Jack still sucks his thumb, after researching it, the theory is he was taken from his mom too early but Donn has never so I think it’s just his personality.  I haven’t seen him do it for a while so I thought I better document it before he stops all together.  He likes to snuggle up to Donn… that’s her, not a mirror.  They are extremely sweet to each other… well, until suddenly one lunges at the others throats and the (play) fight is on.  So entertaining!