You say that Ilyn is Shab's "new" master. Who is the old one?
You might have noticed that on Shab's back is an empty saddle made of the finest mantua. It was the seat of the Giving Rajah who became the Begging Rajah but is now the Perpetually Sobbing Rajah. He was so giving of his riches that he even tried to feed gems carved as lady bugs to a living monster poinsettia, which of course bit off his hands. For a while, the raja tried begging from the back of his formerly proud and now ashamed dog, Shab, but it was no use. Shab's eyes only began to glow red with the shame of his master's indiscretion.
Finally the begging rajah was able to give up begging and live here in this place of death and peace and learned to take on sorrow as his only sustenance. If you look over there in the shadow near the gate, you can see him holding himself up in his grief and sobbing against the stones, having just seen Shab wander off once more with the cart and the redundant saddle.