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It means 1 of them is coming it heat. Need a male! good luck.
your guinea pig is affirming it's dominance over the other, it is perfectly normal behaviour
2008-11-15 00:35:28
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Q: Why do female guinea pigs mount and rapidly thrust other female guinea pigs?
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Related Questions

Can male rabbits and female guinea pigs mate?

The rabbit might mount the guinea pig, but there won't be any babies. A rabbit will try and mate with a guinea pig no matter what sex.

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Dear readers Mount Bosavi is a volcanic mountain in Northen Papua New Guinea!

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The highest point in Papua New Guinea is Mount Wilhelm, with a height of 4,510m.

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It's a very bad idea. The male will continually bother and harrass the female and even sometimes manage to mount and succeed, whether you THINK she's in estrus or not.

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Will a male dog still mount a female if not in heat?

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Probably to show dominance.

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How can you get the female dog to let the male dog mount her?

The female dog would have to be in heat.

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