Okay, so I just went out to work on the exterior of my parent's home and found a dead cat, what should I do?

So I walked out only to stumble upon a big dead cat (probably 20 pounds if not more). Obviously it was killed by my brothers dog, but it was in our backyard, and well, all furry things tend to die when entering my bro’s dog’s lair (but she LLLLUUUUURRRRVVVVEEESSSS people, if you were a thief she’d go belly up demanding for a belly rub). Anyway, what should I do? post flyers saying FOUND: dead cat in our backyard? Approach a neighbor to whom I believe the cat may have belonged to? Toss it? Currently it’s double bagged in a cooler. Advice?