It is a warning when it is mild chattering or with server chattering it is about to attack. If it is chattering its teeth at you try offering it a carrot or a treat and reestablish your relationship with it if it is at another piggy then keep them together unless it gets server and a attack is pending when they need to be separated they can start fighting for many reasons but mainly can be reintegrated back together.
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It means they need a chew toy. They need to wear down their teeth. Get them one as soon as you possibly can.
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Guinea pigs chatter with their teeth when they're aggravated or getting mad. It's a warning signal of a sort.
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My Guinea Pig does this when he is nervous, sometimes I also think she wants to get my attention. Chew things are essential to Guinea Pigs having healthy teeth.
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It is not from them getting mad or "warning" you unless you do something to HARM them. They will only use this as a warning when another guinea pig is being aggressive to them.
If the guinea pig is doing it "TO" you it is because he/she is nervous or scared when you are holding her or trying to pick them up. Just use calm words, and a treat of parsley or another veggie to reward them and put them at ease.
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Some guinea pigs do it as a warning to another guinea pig but others sometimes just do it as a dislike to a sound or action.
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Sometimes they are talking or even trying to attract another female
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He is simply hungry i get it all the time from my little baby
you will often see them rubbing their teeth backwards and forwards. They are just grinding their teeth so they don't grow too long. that's why they might chew on wood and plastic sometimes. it completely normal.
Hope this is helpful8
