A three-month-old Kelpie dog named Willy underwent surgery this month in Australia to remove a second penis [1].
The procedure addresses a rare congenital condition known as diphallia. Because the extra organ caused physical encumbrance, veterinary intervention was necessary to ensure the dog's long-term health, and mobility [2].
Willy was born with the additional organ located on his leg [2]. Medical professionals noted that the condition is exceptionally uncommon in canines. According to reports, there are only four documented modern cases of diphallia in dogs [1].
Dr. Lauren McNamara, who treated the animal, said she had never seen the condition before [2].
The surgery took place in May 2026 [2]. The procedure aimed to eliminate the physical obstruction caused by the malformation, allowing the puppy to develop normally as he grows. The removal of the extra tissue prevents potential complications associated with the abnormal growth, and improves the animal's quality of life [1].
Kelpies are highly active working dogs known for their stamina and agility. For a breed defined by its movement, a physical deformity on a limb presents a significant risk to their ability to function. The successful surgery ensures that Willy can maintain the mobility typical of his breed [1].
Veterinary surgeons monitored the puppy closely following the operation. The case has drawn attention due to the extreme rarity of the condition in the veterinary world, providing a documented example of a surgical solution for diphallia in animals [1, 2].
“"I've never seen this condition before,"”
This case highlights the rarity of diphallia in canines and the role of corrective veterinary surgery in managing congenital anomalies. By removing the physical encumbrance early in the dog's development, surgeons prevent permanent mobility impairment, which is critical for active breeds like the Kelpie.
