hi, my sheltie is nearly 6 mths old and when it rains he sneakily craps in the house.its infuriating what can we do to stop him please ? we never can catch him at it and he will go anywhere, not even in one spot.he doesnt give any indication he wants to go.weve tried odour removers and nomarking sprays, all waste of money. he plays in the rain and walks fine on the wet grass, doesnt seem to bother him.he wees outside though regardless of the rain.we are at our wits end with this and may rehome if we cant fix this issue.any advice will be very appreciated. thanks