Abstract: Disclosed is a leash holder assembly that is removably mountable to the collar of a pet, and including a leash holder made of flexible material and having face-to-face rectangular panels that are stitched along their bottom and side edges in such a manner to provide an open-topped pouch for storing a leash in coiled-up condition, and including a rectangular closure flap that can fold over the top of the pouch to close the pouch, Velcro fastening elements used to secure the closure flap. Velcro equipped tabs secure the holder to the pet collar and the leash is attached at one of its ends to the collar and the handle of the stored leash protrudes through an opening in the pouch. The leash is quickly deployable when required by grasping the handle and pulling it away from the pouch so that the leash uncoils from the grasp of the pouch.