Abstract: These breeches for dogs comprise a back portion followed by a rear part which comes back over the posterior of the animal and presents a circular opening from which extends a pocket into which is introduced a bag, and a belly element connected to the rear part and connected by its free end to the back portion by straps. Fixing elements provided about the opening cooperate with complementary fixing elements mounted on a removable piece provided with an opening. The free edge of the bag is sandwiched between the rear part and the movable piece and is nipped by the fixing elements.