Easy-to-train dogs are more adept at forming an association between a prompt such as the word "sit" , an action sitting , and a consequence getting a treat very quickly.
Biewer Terrier Dog Breed Pictures, Characteristics, & Facts
Many breeds are intelligent but approach training with a "What's in it for me? You can also choose to shorten their coat which would reduce the need for brushing.
Low-sensitivity dogs, also called "easygoing," "tolerant," "resilient," and even "thick-skinned," can better handle a noisy, chaotic household, a louder or more assertive owner, and an inconsistent or variable routine.