Arbas Hamaz Hamid, 24, was among five people who descended on the vet’s surgery in north Acomb, said Kathryn Walters, prosecuting.
For several minutes, the group confronted the vet in a small consulting room before Hamid struck.
York magistrates heard he was angry because the dog had died while undergoing surgery at the vet's.
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The Most Music Weekend with Amanda Charlesworth playing Empire State Of Mind by Alicia Keys
