Alfonso Diaz, 17, is accused of taking out his anger on his sister’s pet snake by using a knife to cut a deep gash in its tail.

Diaz was arrested at his family’s home in the 200 block of Carnahan Street, near downtown, late Saturday night.

A report from San Antonio police stated that officers were called to the home for a disturbance and found the Ball Python with its tail "filleted."

The report describes the injury as a gash, about 2-3 millimeters deep, in the snake’s tail section.

Detectives said Diaz admitted that he threw a knife inside the home while he was arguing with another woman on the phone.

The report stated that investigators believe he intentionally cut the snake, but he denies harming it at all.

Diaz already was under house arrest in connection with another crime when he was arrested Saturday, according to the report.

It stated that he told investigators that while he was “stuck in the house,” he was unable to resist temptation and drank alcohol.

The report also stated that the snake's owner said she has accused Diaz of animal abuse in the past.

However, a search of public records did not yield any information about Diaz being arrested or convicted of that offense in the past.

“That’s really, really unfortunate,” said Jarrod Forthman, manager of Animal World & Snake Farm Zoo in New Braunfels, about the latest accusation.

Although Forthman has no involvement in the case, he oversees more than 250 snakes, including several of the same species as the one that allegedly was abused.

“These guys are just a docile species, and that actually makes a fairly good pet,” he said.

Forthman said there is a lot of misunderstanding about snakes, but most actually are harmless.

At the family’s home Tuesday morning, the boyfriend of Diaz’s sister said she was still too upset to talk about the weekend incident.

He said the snake -- named “Chimera" -- is still being treated by a local veterinarian.

The boyfriend said he expects to find out later this week whether the animal can be saved, or if it may have to be put down.

Diaz, meanwhile, remains in the Bexar County jail with bond set at $20,000.

For a list of recent stories Katrina Webber has done, click here.