When my partner and I returned home after a 1 month trip, we discovered caches of 1cm food pellets (dog food?) in various places in our house: in one boot, in t

When my partner and I returned home after a 1 month trip, we discovered caches of 1cm food pellets (dog food?) in various places in our house: in one boot, in the pocket of one backpack, under our bedroom pillow, nestled between two couch cushions. The neatness made it seem mysterious: Did I forget I had stowed dog food in my backpack, and while packing let the backpack drip on our bed and couch? The boot is what gave it away as mousework.