You can care for other players’ creatures in the same way you care for your own. You receive the same amount of DNA and Sanctuary Points you would when caring for your own creature.

Caring for other players’ creatures in Sanctuaries is a great way to collect DNA from a creature you’re missing. You can also ask members of your Alliance to place the creature you need in a Sanctuary you have access to. This is a nice way to get the specific DNA you need.