How old does a Teddy dog go into heat for how long? Teddy females start to come into heat at 6-10 months depending on their body type, and Teddy males usually come into heat after one year of age. Females usually come into heat twice, from March to May in the spring and from September to November in the fall, for 6-14 days each time, with a few up to 21 days. There is no set time or cycle for male dogs to come into heat, and mating between Teddy males and females is generally based on the female’s heat period.
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