Renzo, a 4-year-old Belgian Malinois, had been with the police department for about 18 months. In November, he bit a Coconut Creek police officer while tracking a suspect, wounding the officer's leg.
In a more severe attack last week, Renzo burst from a squad car and tore into a doughnut shop employee's calf. The worker has hired a lawyer, US media reports said.
Following the two attacks, Coconut Creek police chief said he has decided to "retire" Renzo.
"I have made the decision to retire K9 Renzo," Michael J Mann said.
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DiBlasi screamed Renzo's name and three times hollered "fuey!" an obedience command for "incorrect behaviour." The dog started to charge another officer, then changed course and dashed toward doughnut shop employee Robert Doherty, 37, who was reaching into his car for his apron, Margate police said.
Doherty heard DiBlasi screaming at Renzo and jumped into his car. But he could not get his leg in fast enough and was bitten. He suffered four bites, to his right calf and shin.
DiBlasi tripped and lost control of Renzo, who spun around and bit Giuttari, inflicting "multiple puncture wounds," Coconut Creek police reported.
The dog will now live with DiBlasi, his handler.