 It is a hardy breed , and can be stubborn , leading to issues with training . A Westie may need to have its training refreshed on occasion during its lifetime . Having a typical terrier prey drive , it tends to be highly interested in toys , especially chasing balls . It does retain the instincts of an earth @-@ dog , including inquisitive and investigative traits , as well as natural instincts to both bark and dig holes . It is ranked 47th in Stanley Coren 's The Intelligence of Dogs . 
