Aggression and intimidating behaviour has seen an Auckland vet temporarily suspended.
Dr William Baird, owner of Great South Vets, has been found guilty of professional misconduct.
The Veterinary Council says he did not cooperate with an investigation and had behaved in a threatening manner towards a junior vet on several occasions.
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In one incident, Dr Baird told a junior vet animals didn't feel pain - and when they disagreed with him, he "got right in my face and yelled that drug companies sponsor the research that alleges animals require pain relief in order to make money", the junior vet claimed.
"An order of suspension sends a strong message to the public and the veterinary profession, including young graduates, that Dr Baird's conduct is not acceptable under any circumstances and will not be tolerated," said Veterinary Council registrar Iain McLachlan.
Dr Baird has had his registration suspended for nine months.
He was previously suspended in 2007 by the UK Disciplinary Committee of the Royal College of Veterinary Surgeons for failing to attend a distressed and dying dog.