愛犬【あいけん】
pet dog, beloved dog, love of dogs, fondness for dogs
飼い犬【かいいぬ】
pet dog
野犬【やけん】
stray dog, ownerless dog
犬猿の仲【けんえんのなか】
like cats and dogs, (on) very bad terms, relationship of dogs and monkeys
番犬【ばんけん】
watchdog
猟犬【りょうけん】
hound, hunting dog, gun dog
負け犬【まけいぬ】
loser, failure, underdog, unsuccessful person, non-achiever, loser dog, unmarried and childless older woman