Acute kidney failure after operation

Hello, my ten years old maltese had a surgery. It was a small operation of one centimeter skin growth. Research lately showed the skin growth wasn't cancer. My dog was healthy before the operation. Vet made all necessary medical investigations before the operation. All blood parameters were normal. My dog was full od energy and life before the surgery. After operation dog wasn't feeling good. He get worst day by day. He started vomiting and refusing food. We took him to the vet. He gave him some medicine against vomiting. The vomiting stopped. But he still didn't want to eat. We took him to the veterinary again. Blood test showed acute kidney failure. Vet healed him with infusions, antibiotics, NSAIDs. After one month of treatment...the blood test showed Urea 90+, Crea 400+. There was no hope any more. He fell asleep forever. How is it possible.... deadly acute kidney failure after operation at healthy dog? Side effect of anesthesia? Overdose of medicine during surgery? After diagnosis vet healed my dog with NSAID Ficoxil (in directions for this medicine writes: "Do not use for dogs under 3 kg." but my maltese had 2,4 kg), was it right medicine? When my dog get an ulcer on tongue due to renal disfunction, vet healed him with antibiotics Convenia and Cylanic. Was it right medicine for dog with renal disfunction?

Hello - I'm so sorry to hear that your dog passed away.  You don't mention a SG so I take it that the high urea and crea werent just down to severe dehydration.   Because we don't have the notes or full information in this case, its inappropriate to try to pass judgement on your vets' treatment and this isn't really the purpose of this site.  Helpful people to have a retrospective conversation with include the vets - I dont know one vet who wouldnt try to figure out whether they could have done anything differently after a pet has passed.  Alternatively, the RALPH (web)site may be able to tell you how to get a post-humous second opinion, or perhaps your vets might agree to send the clinical notes (in the UK they are obliged to keep a copy of them for a certain time) to an independent referral medic. Finally, the RCVS has a complaints procedure, but it sounds as though you are rather after a discussion, which should ideally be done with the vets involvement and a copy of the clinical notes.   I think that questioning events is an important part of greif and hope that one or more of these avenues proves helpful.