Black and white

This weekend our son M visited us. He was occupied in the morning, so I took his dog Gismo out for a walk together with Omo.
Gismo is 9 months old, Omo nearly 11 years, so quite a difference. One pulling at his line, changing direction, reacting to all noises. The other calm and relaxed.
Omo of course had to tell Gismo the rules, who is the boss. But when I let both play in the Gersprenz, the rivulet close to our house, Gismo could not else but tease Omo, trying to swap places on the social ladder.