As of 2015, the longest tail on a dog measures 30.2 inches (76.8 centimeters), belonging to an Irish Wolfhound!
Mammals - Facts for Kids

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Random Facts About Mammals For Kids
A tiger’s tail can be up to 3 feet (1 meter) long and helps them balance when running and turning quickly!
Margays are usually quiet cats, but they can make up to 13 different sounds including meows, growls, purrs, and a special bird-like chirping sound.
Leopards use their long tails as counterbalances when leaping to catch birds in mid-air!
Male wallabies continue growing for several years after leaving their mother!