Lena Dunham's dog bit her on the butt: See a photo of her bloody underwear

lena-dunham-dog-bites-her-butt.jpg Sometimes man's best friend can actually be your worst enemy.

Lena Dunham had a not-so-fun time with her dog on Wednesday (May 28), when her rescue dog, Lamby, got a little too agressive.

"My dog bit me on the a** and Jemima Kirke captured the image of a life time," the "Girls" creator/star writes, sharing a photo of her bloody underwear:

lena-dunham-dog-bite.jpgSo why did her pup turn against her? "Lamby has bitten me twice and both times it was in response to me sobbing," Dunham tweets. "Can I turn this info into some kind of animal behavior thesis?"

And for those wondering, the bite isn't serious, as Dunham took to Twitter on Thursday to assure fans she was doing OK. "The bite doesn't hurt that much," Dunham tweets. "Just continuing to make pathetic excuses for my dog: he had a hard childhood, my shorts were too short, etc."

Gotta love Dunham's confidence in sharing photos of her bloody behind.
Photo/Video credit: Getty Images, Instagram