Q. My wife is convinced we have a mouse problem. But I have not seen any – and I am working from home now more than ever. When is it time to call a pro for a pest inspection? Alex W., Philadelphia, PA A. Mice are most active at night, so you may not actually see them but still have a problem. Your wife may be concerned because she has observed some of these tell-tale signs: Small, dark rice-shaped droppings Gnaw marks on food packaging Your house cat or dog is showing unusua