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A male is ready when his testacles drop. This will happen between 5-9 months of age. He will learn what to do by instinct. A female is ready when her back side is swollen and has a little bit of blood coming out. This happens every 6 months. Tit usually starts between 5-9 months of age as well. Some dogs don't mature as quick as others, so the age of heat isn't guaranteed

(All above had been written by a novice and should not be followed at all)

Great Danes do not under any circumstances get bred by the sentences above. Females should not be bred before 2 years of age, preferably after 3 heat cycles. These cycles happen anywhere between 7-12 months from each other. Males at the earliest should breed at a year and a half. Both sexes should be cleared of any health or genetic problems and tested and certified for these health problems.

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13y ago

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