Never Adopt Siblings
Many families unknowingly make the mistake of adopting siblings. Siblings are two puppies that come from the same litter and are either brother and sister, sister and sister, or brother and brother. It is often tempting to adopt two puppies in order to give each puppy a playmate when the family is away at work and/or school.
When you adopt a Cavalier King Charles Spaniel puppy or any puppy for that matter you need to only adopt one puppy at a time because during the 10-16 week period you will need to be the primary focus for your new puppy. If your puppy is left with a sibling during this period their canine instincts will kick in and they will attach to their sibling over you which can lead to authority problems later on.