it's a collie thing.
i have had a collie or collie cross since i got my first one at 12.
they have all had the same fascination for whatever was on offer.
sally, my current working collie, spends her whole waking hours organising the chickens, and when they go to bed she moves on to the ponies, who like the geese, think that they are the boss of her. they're wrong!
a collie needs a job, it's what they are bred for. if you don't give them one, they will invent one. this is the reason that in the wrong hands they don't always make good house dogs, they can be obsessive about children too. a collie has a different mind set to any other dog on the planet, and need an understanding trainer.