Hi Elena,
my parents have had 3 Papillons and all have been and one still is a great dog, so dont worry too much, i'm sur the little one will calm down eventualy 🙂
They are very intelligent and highly trainable, Reuben has easily learned basic commands and my dad is teaching him agility at home. He is on a waiting list to go to proper agility classes as he thrives on it.
He was very lively as a pup but calmed down as he got older , he is two now and a very good dog.