As youall know I go t a new doggie names Toto. Hes my cairn terrier. and than I have Mason my yorkie. I free feed Mason but i have noticed that if food is left out than Toto will eat it all in one serving....I want Mason to still have his free feed option but i know it says cairns can gain wait really easily so i am trying to control that also. Do you guys have any ideas.....I think when he was at his previous "owner", i use the word loosely. she had ALL these dogs just running so i think he had to pretty much just eat as fast and as much as he could get. When he first came here all he wanted to eat was cat food....so......i dont know..im at a loss.....Masons used to snacking when ever he wants.