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Beware Of Dominance Behavior In Male Guinea Pigs

The chattering of teeth by two young, male guinea pigs is one sign of brewing battle for dominance.

Shannon Cauthen
Posted: December 3, 2013, 3:10 p.m. EST

two guinea pigs
© Guinea Pigs Milly and Mikey/Courtesy Cathy Rollit
Guinea pigs are social animals that do best in a pair or group, but take care how you group or pair in order to avoid babies or fights.

Q: I have two male guinea pigs, one is 6 months old and the other is about 5 weeks old. When I introduce them, they chatter their teeth at each other. What does this mean? And the older one is always mounting the younger one and won’t leave him alone.

A: When guinea pigs chatter their teeth it is an indication that they are very unhappy with the situation that they have been placed in, and they are unhappy with each other. The mounting is not sexual in nature but simply means that the mounting guinea pig is going to be the dominate guinea pig in the relationship. Or literally that guinea pig is communicating, "I am going to be the top guinea pig.”

If the younger guinea pig agrees to be the less dominate in the setting, he will allow himself to be mounted. If the younger one allows himself to be dominated, he will challenge this position as he transitions from baby to teenager and then again when he is an adult.

Guinea pigs demonstrate this behavior even if they are related. There always has to be a pecking order; if not, there will be war between the two. If neither guinea pig agrees to be submissive, they will hurt each other — perhaps fatally. Death can occur either from injury done to each other in a fight or by the level of stress within the cage that causes eventual death from lack of ability to thrive.

Through observation, you must determine if this is a healthy environment for both guinea pigs. You must observe both now and in the future to insure that the environment remains healthy for both and that they are fully compatible throughout their lives together. Human roommates or family members must live separately if they become incompatible, and the same is true for guinea pigs.

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Posted: December 3, 2013, 3:10 p.m. EST

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Beware Of Dominance Behavior In Male Guinea Pigs

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Please help.
Lochlan, International
Posted: 8/14/2016 1:42:59 AM
My 2 male guinea pigs (tip and tippee) are nearly a year old. Tip has been mounting, humping and grumbling at tippee every day. In a day tippee gets hummped 3 to 4 times he screams as it happens. Tip has seperation anxiety and sometimes humps tippee if we have held him too long. Tip also pee's on tippee. Tip is smaller and faster than tippee. Tippee leads tip around when exploring. Is this matural. Seperation doesnt work he just humps him as soon as their back together.
Lochlan, International
Posted: 8/14/2016 1:38:22 AM
I have two guinea piggies. They are a year and a half old. Have been living together since ever. They used to teeth chatter at each other from time to time but lately it is happening at least once a day. It nevet ends with a fight, they continue to play together soon after. Is this normal? They also don't figjt for food or water.
David, International
Posted: 12/22/2014 8:22:52 AM
I have two male guinea pigs that I bought together four months ago. I'm not sure how old they were, but definitely not adult. They have just recently started fighting. It began with the teeth chattering and mounting, and has escalated to all-out war with blood being drawn.

I bought them in a pair so that they could have a friend. Now I'm afraid that they don't like each other. What should I do? Separate them temporarily, separate them permanently, or let them work it out?


Barbara, Bella Vista, AR
Posted: 4/18/2014 1:32:25 PM
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