3. The Cavalier King Charles Spaniel
Some dogs are known for having great wits, being athletic, and for their kind hearts whereas others are just a tad slower to comprehend. For one, the dog has a multitude of names, which means it has a long list of lineages. Anytime a dg breed has multiple monikers, it suggests that there have been some issues with breeding in prior years. As if breeding issues are not enough to tip the boat, this spaniel breed has been known for inbreeding throughout its history, which could be an indicator as to why the intelligence is not quite all there. They are known to be difficult to housetrain and they can even become agitated and anxious upon formal training. Be mindful of these potential deal breakers when if you are planning to get this breed.