The owner wanted an affordable bladder stone surgery in 2009 and vets of my generation often strived to provide least medical cost by not asking for X-rays pre and post operation or blood tests at the first visit.
For example, this poodle had blood in the urine and the abdomen was very painful near the bladder region. I informed the owner of the diagnosis of bladder stones although there was no X-ray or stone analysis done to lower his medical costs by at least $200. He wanted an immediate surgery.
I gave an IV drip and antibiotics and operated on the same day of consultation. I told the owner that the dog had 20% chance of survival on the operating table.
If the dog is given an IV drip and stablised for 24 hours before surgery, the survival rate will be much higher. However, this dog did survive and so the owner had a favourable impression of me and I saw his trembling poodle, the sibling of the afore-mentioned dog with bladder stone surgery.

In 2013, the expectations of a sophisticated younger generation of pet owners who trawl the internet and knows much more than the vet means that all processes and advices must be properly documented as supporting evidence in cases of litigation. I would record AMA (Against Medical Advices) and ensure close communication with the owner.
Life was much simpler in 2009 and in earlier years, but the vet has to be much more careful in giving informed consent and recording all medical advices in the litigious society of first world Singapore.