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.
Reproduction in dogs - season, heat, oestrus, pregnancy tests. Puberty or sexual maturity in the female dog usually occurs around six months of age. The smaller breeds tend to go into oestrus or heat earlier and some females can have their first heat cycle as early as four months of age. On the other hand, the large and giant breeds can be up to two years old before they come into heat for the first time.