Male cats that are not neutered tend to roam, become territorial, acquire illnesses, and develop inter-cat aggression. Roaming male cats, constantly in search of a female, lead to unwanted pregnancies. Fighting behavior sends many cats to the veterinarian often to care for wounds; they also risk contracting many infectious diseases, such as Feline Immunodeficiency Virus (FIV). Male cats that will not be bred should be neutered by around 6 months of age. Your recovering cat needs to be rested-no running or jumping as overactivity can lead to complications such as bleeding and infection.