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This is normal with hamsters. Please do not worry about Yogie. You may notice it more when they go into Estrous every 3-4 weeks when the Yogie is ready for breeding and the hormones change. Hamster's urine is very thick and can actually go from a creamy milky color to a darker brown color. You may gen get a foul smell when the urine is thicker in constancy during the Estrous period. This link explains the Estrous cycle in mammals: http://en.wikipedia.org/wiki/Estrous_cycle
Are you sure Yogie is a male? We see this more commonly in females, but males can also have the milky urine. Their urine is thick normally, an it does change colors. In females in Eterous there is usually the stronger odor. The milky urine is still normal even if Yogie is a male. Joan
I will be happy to opt out and allow another Expert to assist you. We definately want you to be happy. Joan