Help me about dog body language!?

Hi,There is a female stray dog near my living place with six puppy.Due to cold weather I decided to feed the dog and it's puppies but each time I finish feeding when I want to leave the place the dog chase me aggressively with barking and growling! when I stop she also stops and bark and growl!! I cant... show more Hi,There is a female stray dog near my living place with six puppy.Due to cold weather I decided to feed the dog and it's puppies but each time I finish feeding when I want to leave the place the dog chase me aggressively with barking and growling! when I stop she also stops and bark and growl!! I cant understand this behavior!Does it see me a threat!Wants more food!?Any help to understand this behavior is appreciated. meaning
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