Khloe Kardashian and her estranged husband, Lamar Odom, are reportedly in a nasty custody war over their puppy Bernard.

While the exes try to work it out, the Keeping Up with the Kardashians star, 29, has given the boxer to her assistant.

“Lamar was hysterically crying when he found out Khloe gave away their dog after refusing to let him see the pup until he got sober and cleaned up his act,” a source told MSN’s Celebrity Fix.

The NBA player has said he will “fight to the death” to get Bernard back, but insiders say Kardashian isn’t budging because “this is the one thing she still has over her control.”

After four years of marriage, Kardashian filed for divorce from Odom last month after being estranged from him for months before that. Odom was plagued with drug addiction rumors and Kardashian reportedly did everything in her power to try to get him to go to rehab to no avail, which ultimately ended the marriage.

image: NBC