doghouse C2+

/ˈdɔɡˌhaʊs/ a small shelter for a dog; figuratively, a state of disfavor

dogged C2+

/ˈdɔɡɪd/ persistent and tenacious in pursuing something

bulldog C2+

/ˈbʊlˌdɔɡ/ a stocky short-faced dog breed; to attack or hold stubbornly

doggedness C2+

/ˈdɔɡɪdnəs/ persistent determination; tenacity