We recently re homed a Jug dog cross between a Jack Russel and a Pug he is nearly 2 and a half, been with us 2 months. We recently had him castrated don't know if that's important. The last two weeks he has started carrying things around when out walking. Today it was an acorn yesterday a tiny stick he gives it to you if ask but then will then look for something else to carry. Any ideas?