The breed is highly affectionate, they are playful, extremely patient and eager to please. As such, dogs of the breed are good with children and other dogs. Cavaliers are not shy about socializing with much larger dogs. Cavaliers will adapt quickly to almost any environment, family, and location. Their ability to bond with larger and smaller dogs make them ideal in houses with more than one breed of dog as long as the other dog is trained. Cavaliers are great with people of all ages, from children to seniors, making them a very versatile dog. Cavaliers are naturally curious and playful, but also enjoy simply cuddling up on a cushion or lap.
Cavaliers are active and sporting. As Cavaliers tend to regard all strangers as friends, they will also never make a good guard dog. Being a spaniel they have a strong hunting instinct, and therefore should be watched around birds and small animals. However, owners have reported that through training their Cavaliers live happily with various hamsters, gerbils and so on.