come in heat

come in(to) heat

and come in(to) season

[for a female animal] to enter into the breeding season. This animal will come into heat in the spring. When did your dog come in season?

Name	Pronounced	Usage
Eos	e-aws (Ancient Greek), EE-aws (English)	Greek Mythology
Sly	SLIE	English
SeÁN	SHAWN	Irish
Alexandria	al-əg-ZAN-dree-ə	English
NoËLle	no-EL (French)	French, Dutch
Bibek	-	Nepali, Bengali