At BreedMyDog we have found the TCI Shunt system (transcervical insemination shunt system) really useful when it comes to AI success. The shunt enables a seal to be made within the bitch’s vagina, simulating the events in natural mating. In addition the seal allows the vagina to be inflated to make AI through the cervix much easier. Here’s a picture of the system we use. It has been developed and promoted by the reproductive experts Minitube of America.