Credit: Sam Greenwood/Getty Images; PETA

PETA has sharpened its claws in a new ad mocking Tiger Woods.

The animal-rights organization plans to erect a billboard near Woods' Windermere, Fla. home, ExtraTV reports.

The giant ad reads: "Too much sex can be a bad thing...for little tigers too. Help keep our cats (and dogs) out of trouble: Always spay or neuter!"

Following last week's public apology, Woods, 34, reportedly flew to Arizona to continue treatment in a sex rehab.

One person in Woods' corner: also-controversial singer Chris Brown, whose reputation has been tarnished since last year's incident in which he beat then-girlfriend Rihanna.

"Whatever his personal life is -- and I think this goes for me and him -- his personal life is his personal life," the singer said on radio show Mojo in the Morning. "People make mistakes...So my hat is off to him. I support him, I hope he gets back on the field and does his thing."