Bismillahir Rahmaanir Raheem
Al Jawaab Billahit-Tawfeeq
If the animal is large (cow, camel, buffalo) then two people can jointly do Qurbani of that animal. The only condition is that every person who have a share in that animal has to have at least 1/7 share of the whole animal. So 50% each between the two of you is fine if the animal is large.
However, if the animal is small (sheep, lamb, goat) then every person will have to do one whole animal each.
(See Fatawa Mahmudia V17, Pg405)
And Allah knows best |