- Give a dog a bad name
- Glory hound
- Go tell it to birds
- Go the whole hog
- Gone fishing
- Gone to the dogs
- Grab the bull by its horns
- Grease monkey
- Grin like a Cheshire cat
- Guinea-pig
- Hair of the dog
- Hangdog expression
- Hanged for a sheep as a lamb
- Hay is for horses
- Healthy as a horse
- Herding cats
- High on the hog
- Hive of worker bees
- Hold your horses
- Hornets' nest
- Horse of a different color
- Horse trading
- How the hog ate the cabbage
- Hungry as a bear
- I'll be a monkey's uncle
- If wishes were horses, beggars would ride
- If you fly with the crows, you get shot with the crows
- If you lie down with dogs, you will get up with fleas
- In a dog's age
- In a pig's eye
- In donkey's years
- In the catbird seat
- In the doghouse
- It's not the size of the dog in fight, it's the size of the fight in the dog
- Juggle frogs
- Jump the shark
- Kangaroo court
- Keep on a short leash
- Keep the wolf at bay
- Keep the wolf from the door
- Kettle of fish
- Kill the fatted calf
- Kill the goose that lays the golden egg
- Kill two birds with one stone
- Knee-high to a grasshopper
- Know a hawk from a handsaw
- Lame duck
- Lap dog
- Leopard can't change its spots
- Let sleeping dogs lie
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