The six-month-old puppy was born with multiple uncommon malformations which left him with just half his spine, no pelvis and small constricted hind legs.

When he was still only a little puppy, he was obliged to undergo a bilateral amputation of his hind legs, but that has not slowed him down.

He suffers from multiple conditions, including a human ailment known as Sacral Agenesis (Caudal Regression Syndrome) and Sacrocaudal Dysgenesis – presumably combined with a form of Spina Bifida.

In addition, Bonsai was born a Walrus Puppy, meaning he was engorged with fluid which, combined with a lack of hind end movement, which left him from Swimmer’s Syndrome.

Swimmer’s Syndrome is a disorder in which the chest of the newborn pup grows dangerously flat and the working legs splay out to the sides, placing pressure on the internal organs, Bonsai’s owner Elizabeth Hart writes on his fundraising page.

It is curable with time and therapy but there is no solution for Bonsai’s deformed spine and pelvis, which is the reason for the amputation of his hind legs.

Bonsai will require multiple in-depth examinations on his interior anatomy to help manage his conditions, including a pricey MRI scan and other complex imaging treatments.

Ms Hart writes on the page that they have yet to locate a single documented incidence of Bonsai’s exact conditions being found in any other live mammal.

The next stage for Bonsai is to obtain a set of custom-made wheels to replace his hind legs and let him walk about.

‘Bonsai has gone such a long way! He is six months old today and we are so proud of his bravery and battling spirit,’ Ms Hart writes on his YouCaring page.

‘He is a source of joy, optimistic perspective, compassion and funny sweet humor to the people that follow his path.’

‘As far as we know, there is no precedence to provide any type of “prognosis” or result for Bonsai, so we’ll just take it day by day and manage any concerns that crop up as best we can.’

VIDEO: