A receptacle assembly for receiving and retaining discharge of body waste of a canine, comprising a strap assembly and a bag assembly. The strap assembly is designed to securely mount upon the body of a canine such as a dog and comprises multiple means for securing it to the canine. The bag assembly is shaped in a form resembling a pear and is made of plastic. The bag assembly comprises exterior and interior walls joined by side pleats for expansion of the bag assembly when filled with fecal matter of the canine.