We had a story arc that involved us saving a pregnant Seskii. We managed to, however we were unable to return in time to bond with the pups. However, for the sake of this question, let's say we did.
One of our PCs died recently. He went alone (hence why he died) on an espionage mission, and he would have likely gone without the Seskii, for the sake of stealth. The Corebook says:
In terms of loyalty, seskii may become particularly devoted to anything and anyone, including other seskii, humans, statues that seem like creatures, and places they call home. They will fight to the death to defend a place or person they deem as their own.
In this situation, since the Seskii would not have been with him, it would have survived, but left without his master. What would happen then?