According to most sources, the human hearing (frequency) range is between 20 Hz and 20,000 Hz (bats can hear up to 100,000 Hz!). What does that mean? Sound is a mechanical wave that propagates through a medium (air, water), and the frequency of a sound wave determines its tone and pitch.
A male dog can mate when he's 6 months and older. For females, it's best to wait until they are 2 years old. That way there is less of a chance of miscarrage and she'll have m â¦ ore time to mature and be physically ready for puppies.
Best Answer: Your dog should be at least two years of age before she is bred. Her heat should last for 21 days, give or take a day. Please do some research on breeding before you jump into it. Minimally she should: - have at least a 3 (preferably 4 or 5) generation pedigree.