Rex and the cat are friends. Unfortunately, the cat wants to hunt the bird – a friend of Rex. In order to prevent that, the dog and the bird prepare some traps for the cat, they use a bucket of cold water and a rubbish bin.

Rex and his master (a boy) read a mushroom atlas together, then they set out for the forest. The dog is very careful, sniffing for edible mushrooms. After some time, he finds a huge boletus. Rex can’t believe his eyes – there’s a dwarf underneath a toadstool. A storm blows up, the friends go home.