Dog growling at cats. is this bad?

My trainer told me that it is ok if my dog growls at my cats when eating (of course not ok if growls at me , which she never does), because dogs that do not growl are those that will bite without warning. My dog growls to my cat and my cat gets the message and leaves. However, I also heard that dogs are not... show more My trainer told me that it is ok if my dog growls at my cats when eating (of course not ok if growls at me , which she never does), because dogs that do not growl are those that will bite without warning. My dog growls to my cat and my cat gets the message and leaves. However, I also heard that dogs are not supposed to growl at cats at all. Opinions?
Update: wow very different opinions like black and white, I am more confused than before now!
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