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  My older pup prefers cement.  I have a nice grass yard for him to pee and poo in and he chooses to do his business on the sidewalk.
 I know he has allergies...I am not sure if the grass irritates his belly since he's fairly low to the ground or it's just itchy or what...but he hates walking in grass.
 
 His former owners used pea stones in a designated potty area.
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