My Guinea pigs are biting each other?

I have two female guinea pigs one is a lot bigger than the other and the bigger one has been following the other around sniffing her butt this past week constantly. But now the bigger one came up to the smaller one and it looked like she was either trying to take food out of her mouth or she was biting her teeth.... show more I have two female guinea pigs one is a lot bigger than the other and the bigger one has been following the other around sniffing her butt this past week constantly. But now the bigger one came up to the smaller one and it looked like she was either trying to take food out of her mouth or she was biting her teeth. Anyway the little one squeals very loud when the bigger one messes with her. It almost sounds like she is in pain I have tried to seperate them but the little one does not like to be seperated. Is this normal? Will they stop?
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