food envy id seek some pro training..sometimes it starts when they are fighting for food in the litter..happens sometimes when you give them a treat they will take it then growl if you go near them..its best to try and nip this in the bud..some people say take there food off them and give them it back after 2 mins and so on until they stop growling...i wouldnt do this myself...some people give them a tiny amount..when they finish they will look at you for more...so give them more...and so on so they realise they are comming to you for food and become less aggressive..