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Jake the Dog, is the deuteragonist of Adventure Time, is a magical dog and Finn The Human's constant companion, best friend, and adoptive brother. Jake has Stretchy Powers (which he has had since he was a puppy), which allow him to stretch and manipulate his body, coming in handy on innumerable occasions throughout his and Finn's adventures. He is the son of Joshua and Margaret. Jake has a brother named Jermaine. Jake is 28 years old (as of his debut he could possibly be in his 30's by now due to the aging of other characters) in magical dog years, though he rarely acts mature. It is inferred that magical dogs such as Jake have as long lifespans as Humans, as demonstrated by an aged Jake in Dungeon Train. Then again, how exactly magical dog years correlate to human years remains to be seen. Both he and his girlfriend, Lady Rainicorn, share a passion for playing the viola. In the episode "Jake the Dad," he and Lady Rainicorn have 5 Rainicorn-dog hybrid puppies. There are many theories saying that Jake survived The Great Mushroom War with his family, as he is always giving Finn information on what happened and what is remained. 
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Jake using stretchy powers with his legs.