No favour goes unpunished!

Jess the sheepdog is keeping a watchful eye.
The question is ... For how long?

So that I may remember the reason for this riddle I will say that my other arf was invited across t'road to remove a spider from a bath and was thanked for his chivalry.
Bar bar
Is their no end to this persons gratitude?
Please let there be, and soon, or else we shall have to stop being good neighbours.