I replaced 2 pet gates with these when I added two kitties to our family.  I have 1 dog.  This was to provide the cats with a safe haven while we were getting acquainted.  They were perfect for that.  I am still using them, but now it is to keep the dog away from the kitty food.  Please note that my 60lb dog was able to get through the pet door at first.  We remedied that by adding a 3 " high piece of plastic to the bottom of the pet door.  Works great.  In retrospect, I probably didn't need the extra tall gate.  It sometimes hinders getting through the people gate with laundry baskets, groceries, etc.