Dobby sometimes gets flashbacks to his time serving in WW1. He still can march like in the old days.

Did you know why caiques do the marching? They stomp to get attention. To impress. To show who is the boss. Or just because they like the sound their claws are making when hitting on the ground sometimes. It has different reasons. And you can't force them to do. Dobby just did it someday and he learned that he get attention when he does it. #parrothaustierwalkingbirdpetsanimals