we just got a blue heeler pup a few weeks ao, shes pretty damn smart. we changed her name and she knew it within days and shes getting the hang of potty training. my gf's 12 month old jack russell terrier mix was never as smart as this dog is now and shes only 4 months old. needless to say the jack russell terrier is no longer living with us. also got a lil chihuahua thats 2 and shes badass.