At the height of my pet owning days I had rescued many cats and dogs most of whom has serious illnesses to overcome. My vet at the time was brilliant and would never charge me for the euthanasias that were sadly inevitable. I had one dog who I thought was at death's door. My vet did tests and laboratory checks on the spot for me after closing time, diagnosed diabetes (in addition to the poor wee mite's other problems), administered daily insulin injections for 12 days, incl Sunday, until the dog was stabilised and then charged me £25 in total. Brilliant vet too and so compassionate.