Sexing Chinese Hamsters
It is important to know whether your hamster is male or female to prevent unwanted litters if kept in pairs (remember that Syrians must live alone). Different health problems can affect males and females, for example pyometra in females.
Chinese hamsters are one of the most easy species of hamster to sex when adult, although it isn't as obvious when they are very young. A hamster, however, should be at least five weeks old when rehomed and by then the differences are clear.
These photos are of five week old normal Chinese hamsters:
Normal male: five weeks old
Normal male: adult
Dom spot male: three weeks old
Dom spot male: five weeks old
Dom spot male: adult
Males with Undescended Testicles
The photos below were taken when he was 6 months old. He subsequently became very obviously male - he's in the right-hand picture above at 1 year old!
Note the close spacing of openings with no fur in between. Nipple lines can be seen on the dominant spot hamster on the right. Both are adults and have never had pups. Nipples are often more prominent in pregnant and nursing hamsters.