The King Charles Cavalier combines the gentle attentiveness of a toy breed with the verve and athleticism of a sporting spaniel. Often called the perfect lap dog, they can be upbeat athletes or shameless couch potatoes, depending on your lifestyle. This toy spaniel has a sweet, melting expression emanating from large, round eyes that have you falling in love from first sight. These graceful yet playful pups grow to 13-18 lbs.