Kristen Stewart and Robert Pattinson 'fighting over dog'

Kristen Stewart and Robert Pattinson are reportedly locked in a battle over who gets to keep their beloved dog, Bear.

The couple's belongings are being divided up following the news that Kristen Stewart had an affair with Snow White and the Huntsman director Rupert Sanders.

Now, Robert Pattinson is adamant that he should get custody of Bear, the pooch the pair adopted from a shelter in New Orleans.

'After Rob moved his things out of their Los Angeles apartment, he then told Kristen he wanted Bear,' an insider told RadarOnline.

'She was heartbroken - they adopted Bear together and she always felt that he was their little baby,' continued the source.

'But Rob was so hurt by Kristen's actions he decided that he wants the dog to help him get over what happened.

'However, Kristen won't give up Bear in a hurry. She helped Rob save Bear from Parvo disease, which nearly took its life when it was a puppy,' explained the source.

'She wants joint custody - and it could get a little messy.'

Robert and Kristen started dating after starring in the highly successful 'Twilight' film franchise together.