I was told that if I get my pet spayed or neutered, it will become fat and lazy.
Proper diet and exercise will prevent pet obesity. Typically feeding slightly less than before the procedure will help with this since hormonal expression will change after a spay/neuter procedure. Spaying prevents certain problems later in life such as an infected uterus (pyometra) and mammary gland cancer. Neutering prevents problems with aggression as well as possible reduction in prostatic disease.