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  1. Dog Breeds
    Weight ranges & lifespan Toy-sized dogs mature fastest, & dogs under 10# are full-grown at 9-MO. That said, no dog should be bred B4 they're 2-YO, for 2 reasons - * 85% of heritable problems will be symptomatic / visible by 2-YO * waiting to mate for the 1st time till they're 2-YO adds an...