I'm sorry for the delay... I've been trying to get somebody from NM to take a crack at this ID.  I really don't think a dog would come this close to a wall and leave a calling card.  Could it be a cat?

I don't know anything about cat droppings or what they look like.  These droppings are very dry and when I've shoveled or swept them off they shatter.  In the meantime I got a product called Critter Ridder in a granulated form.  I sprinkled it all around the front area and on the porch and It has a distinct high power pepper smell to it!   I even sprinkled some on the ledges and it has deterred birds too.  So far, I think it has been my best option.