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In order to sex a mouse while it is still younge you will need to be able to touch them and handle them with the mother approving. in order to sex a female mouse there is a small space between the anus and urinary opening. There are also visible nipples on a female mouse or rat. however in order to sex a male mouse you would see the anus is far apart from the urinary opening. A male mouse has absolutely no nipples whats so ever. For more information please visit:http://www.peteducation.com/article.cfm?cls=18&cat=1804&articleid=2584
Wiki User
∙ 15y ago
Wiki User
∙ 14y agoThe most common visual method is comparing urogenital distance. This is the distance between a mouse's genital area and its anus. If you are careful and well-versed in this process you can determine the sex of a mouse at a very young age.Take the mouse by the scruff of its neck, and turn the mouse on its back. If it's not comfortable with that position, hold the animal in your hand with its rear end facing you , and holding onto the base of the tail, lift so that the genitals are in clear view and the legs are lifted somewhat off of your hand. Examine the openings located near the tail.A female mouse (doe) has a genital area (the vagina or urethra) that is much closer to the anus (the opening directly under the tail). The urethra is usually within about 1/4 inch. A male mouse (buck) has a genital area (penis) much farther away from the anus than in females. To validate the sexing, you may want to compare two mice side-by-side.
Wiki User
∙ 14y agoit is very hard at a young age wait for a few days/weeks but dont leave it to long as they start mating at a young age with males the genital openings are far away but with females they are closer
Wiki User
∙ 14y agoThe way that you can tell the difference between a girl mouse and a boy mouse is that the space from the anus to the genitals is generally larger in males than in females. If you are still unsure about the sex of the mice, contact your local pet store and show the mice to them, they should be able to differentiate the two sexes.....
Wiki User
∙ 14y agosee if it has balls is its a girl it will not have balls....
Wiki User
∙ 14y agoWhen you lift the tail, females will have a larger genital papilla then males.
Wiki User
∙ 13y agopretty much mice are all girls
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