Champ!: Kurumaisu no Inu to Ayunda 15-nen

Did you know that there was once a dog who spent 15 years in a wheelchair…? Champ became paralyzed from the waist down after a sudden accident. To euthanize him or to keep him alive… After agonizing over the decision, the Miura couple decided to live on with Champ. They worked tirelessly to build a wheelchair for Champ to ease his stress and suffering… And then something incredible happened! Champ walked again!!

(Source: Akita Shoten, machine translated)

Note: This is a manga adaptation of a nonfiction book by Eiji Miura, first published in 2003.