I would like to offer you some ideas for your mod, I hope they interest you:
1. Tactical Dog Backpacks for Grey (Dog Backpack). With the idea of a downgrade, reducing the number of inventory cells from 16 to 4 for the same allowable weight load. This will make the mod more realistic.
2. A young, inexperienced demon got into the dog's body by mistake, and when the protagonist tries to exorcise him, he eagerly exorcises him With all his might, helping the protagonist with the exorcism rite, telling him the right actions, and panicking at the inaccuracies in the rite. Now this is the upcoming quest for the Athkatla Search Guild & More mod (SoA) (with another dog, of course). But, as it seems to me, this quest would suit Grey much better.
https://arcanecoast.ru/forum/viewtopic.php?p=2188658#p2188658