Puppy help ! growling from other dogs what do we do ?

okay so we have two dogs all ready, one is female desexed, she is a x boxer australian cattle dog. she is 7 years old, she will be 8 on the 3 of november. the other one is a male, non desexed, he is a english purebreed golden cocker spaniel is 4 he will be 5 on the 24 of october, he has never really been aggresive but he is having issues with growling. i voulentter at the pound and a beautiful female labradore puppy female non desexed about 12 or older weeks ? so i brought her home and she gets along with the older dog now about of growling thats kind of around food at first she was good with her, but the real issues is with the cocker spaniel whenever she goes near him he runs shakes and growls ? why is this we have till the long weekend or she has to go :( can anyone help. and eventually we will have to leave her alon with the dogs ? can anyone help ?