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.
When your female dog is receptive to mating, she is in a stage of her reproductive cycle known as being in âheat.â You can expect this to happen about twice a year beginning between six months to one year of age. Each time your dog goes into heat, the cycle will last about 21 to 28 days.