These are really nice.  I got a large for my 110 lb old guy and a small for my 24 lb old guy.  I say old guys because they're getting on in age and their arthritis is starting to bother them.  These make it easier for them to eat because they don't have to bend down.  And they are nice and heavy so don't move around.  The last raised feeder I got for my big boy was awful, he kept knocking it over and the bowl wasn't secure.  Perfect.