Yollada Champasri, 23, was released on bail from the Wang Thonglang police station, after his relative deposited Bt20,000 in cash as a guarantee.
His friend, Meyani Sitthisuk, 23, filed a complaint with the police station against him, alleging him with killing her dog.
Yollada admitted to the police that he threw the dog down form his room out of sudden rage that it dirtied his room with its droppings.
Yollada said Meyani came to stay with him ten days ago and he tried to warn her not bring along the dog but she begged him to allow the animal in.
Police said Yollada would be charged in court on Thursday.