I think it's both you have to teach the kids to respect the dogs and the dogs to respet the kids we can't always tip toe around the dog they have to get used to their family and how they are that's why I think a lot of breeders won't sell a small yorkie to a family with small kids but they will however sell one that will probably be more of a standard size (6-7lbs) size makes a difference I guess I love that my JoJo was a standard size he was able to keep up with my kiddos and now jasper will be around the same size so it worked out for us. Good luck finding your yorkie baby
