Be on heat

Pro Tip 1/3

Animal Breeding

Used to describe the time when an animal can mate, referring specifically to females.

You should separate the male dogs when the female is on heat.

Pro Tip 2/3

Not for Humans

While this phrase applies to animals, it's not appropriate for describing human fertility periods.

Unlike animals, we don't say a woman is 'on heat'; we use different terms.

Pro Tip 3/3

Behavioral Clues

Animals may exhibit noticeable behavior changes, such as being more vocal or restless.

My cat must be on heat – she's been meowing non-stop and rubbing against everything.