The invention relates to a collar (10) for mounting around the neck (8) of an animal (1), such as a dog, said collar (10) including i) a first part (20) with an inside for receiving the head (5) of said animal (1), said first part (20) having a flared shape, such as the shape of a truncated cone, and including a peripheral flexible wall (W) de-fining said flared shape, said wall (W) extending between a first opening (22) leading into said inside and an opposite second opening (24) leading into said inside, and ii) a second part (40) joined to said first part at said second opening (24), said second part (40) defining a sleeve for extending around said neck (8), wherein said peripheral flexible wall (W) including a recess (R) extending towards said first opening (22) and defining an enlargement of said second opening (24).
