how old is milly?
franta has one small kidney but he is 15yrs old. but as far as i know the other one is working fine , so not a problem at present.
however depending on the reason for them being small and what blood tests show this could be CRF or soon. its best to ask the vet all the questions .....i have seen frantas on xray and he has stone and maybe some crystals blocking it,,,,,,,,,,,,they were gonna send his xrays to an expert to ask what couyld be done but as he has taken over a month to get back to normal after an ordinary op and that his age is old for huis breed, i am not sure i would want to put him through surgury, especially as he would have to travel to bristol which is about 2 hrs journey from here.