The Senvelgo experiment on Dumpy has been abandoned due to persistent diarrhoea. It's probably not related - he was hospitalised with what turned out to be a treatable liver/bile duct infection - but the hospital started him on insulin, so that's that. I am no longer going on holiday this year as I have to be here to inject him - my daughter has taken my place.
He came home on SIX medications - insulin, a daily liver supplement (those first two probably for life), two types of eye drop, an antibiotic and another liver treatment. He is back to normal, though.