Abstract: An adjustable gate including a frame having opposing vertical stiles each with a vertical groove therein, an upper gate section and a lower gate section. The upper gate section can be lowered such that only an adult dog may pass through the gate while preventing the passage of puppies. The upper gate section includes an upper crossbar with ends which slide within the vertical grooves of the stiles. Both the upper gate section and the lower gate section have a plurality of evenly spaced vertical slats. The slats of the upper gate section telescopingly or slidingly engage the slats of the lower gate section when the upper gate section is lowered.