FAIRFIELD (CBS13) —A man intentionally drowned his father’s dog in the pond at Fairfield’s Civic Center—and he doesn’t know why he did it, Fairfield Police say.

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Witnesses reported seeing a man carrying a medium-sized dog into a pond at the civic center and dunking it into the water until it didn’t come back up for air.

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The dog was described as a brown female pit bull with a chain around its neck. She was retrieved from the water by officers on a small boat.

Bryan Cavanah, 21, of Fairfield admitted to drowning the dog, though he said he didn’t know why he did it.

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Cavanah was arrested for felony cruelty to an animal and violation on probation. He is on probation currently through Solano County for assault with a deadly weapon.