Rob Pattinson and Kristen Stewart Fighting Over Dog

By WebVet.com

Kristen Stewart's recent affair is bad news for Bear, the rescue dog she adopted with Rob Pattinson. In the wake of the Twilight couple's fallout, Bear has found himself at the center of an increasingly bitter custody dispute.

Although Kristen is at fault for their messy situation, she isn't giving Bear up without a fight. Rob wants sole custody of the mixed breed rescue pup, but Kristen -- who helped nurse him through his battle with the potentially fatal disease Parvo -- thinks it's only fair she get to remain a part of his life.

Related: Man Spends Over $60000 In Dog Custody Battle

"After Rob moved his things out of their Los Angeles apartment, he then told Kristen he wanted Bear," an insider told Radar Online. "She was heartbroken -- they adopted Bear together and she always felt that he was their little baby. But Rob was so hurt by Kristen's actions he decided that he wants the dog to help him get over what happened. After all, a dog is a man's best friend and Bear is such a good companion."

For those unfamiliar with the situation -- Kristen was outed as an adulterer last week after photos surfaced of her engaging in some heavy PDA with her Snow White and the Huntsman director Rupert Sanders. The actress admitted the dalliance (how could she not?) and issued a heart-wrench public apology to Rob, who ironically, she'd previously refused to publically admit was her boyfriend.

Find out how to navigate pet custody battles here

ROBSTEN PET TRIVIA

Kristen is also mom to a cat named Max, who presumably she'll keep without a fight.

Kristen's mother raises wolf-dog hybrids, and Kristen has a special kinship with the oldest male, Jack. She told David Letterman about the not-so-vicious pup, "He's really sweet. He, like, falls at my feet."

Bear was adopted from a Louisiana shelter right before he was about to be put down. "He was in one those shelters where they don't keep them around for very long," Pattinson told Regis Philbin and Kelly Ripa after the adoption. "He was on his sixth of seven days."

Rob's beloved dog Patty passed away in 2009. He said afterwards, "I keep talking about my dog all the time. It was an incredible dog, and I said in an interview recently he was the most important person in my life. My family went crazy with me for saying that. But, however ridiculous it may seem to some people, my relationship with my dog was a defining moment. Having the dog die was, literally, like the worst day of my life. It was like losing a family member."

Bear:

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