The balls of a 3-month-old male cat are like two round balls, about the size of grapes. They are soft and elastic when pinched. Compared with other animals, the male cat's penis is smaller and further set back, and the foreskin completely wraps the penis. The testicles of all mammals descend from the abdominal cavity to the scrotum after reaching a certain stage of development.

A male cat's balls usually start to grow around 2 months old. Generally, when the male cat reaches 6 to 8 months of age, preparations for castration surgery can begin. The advantage of surgery is that it can prevent male cats from barking during estrus, and it can also avoid the occurrence of many diseases.