This is a simulation model for mastering Canine Neuter surgery. It is possible to simulate skin incisions, heronotomy, ligation and cutting of the vas deferens and arteries and veins, excision of testicles, and suturing. Techniques using a midline skin incision and a technique using a skin incision in the center of the scrotum are possible. This model is now a cartridge type, so only the contents can be replaced and achieved cost reduction.