Snow is melting, mud is everywhere

I have a 5 month old rottie and need help on solidifying his leave it command!! now that the snow is melting there’s leaves, branches, etc everywhere and he brings them inside. even some trash with all the wind, then it got buried in snow and is now resurfacing. I even have a crabapple tree out in the front and I don’t want him eating what has fallen. Tips and tricks please and thank you!🙂