"Počítají svá prasata."

Translation: They are counting their pigs.

[Zimowski]

So, even with "po" Pocitat is imperfective verb. What's the perfective pair of this one?

[ion1122]

spočítat or vypočítat

[Palifico]

Ještě: "propočítat", "přepočítat se", "napočítat", ...

[Cara157705]

Shouldn't it be počitájí (with a long á) and not počítají (with a short a)?

[VladaFu]

No. https://en.wiktionary.org/wiki/po%C4%8D%C3%ADtat#Conjugation

It's the same as dělat, dělám, dělají

[Stefan872489]

Could I also use "jejich" instead of svá?

[VladaFu]

Yes, but svá is so much better here unless you are stressing that it is THEIR pigs they are counting, as a reply to someone who suggested they were counting pigs. And even then svá is perfectly fine even when stressing.