a condition affecting the dog in which one or both testicles do not fully descend into the
scrotum. The condition may be presented in two forms:
cryptorchidism refers to the normal descent of a singular testis.
cryptorchidism results in the retention of both testes.
Due to the
thermal suppression of spermatogenesis, bilateral cryptorchids are sterile while
unilateral cryptorchids are usually fertile.
estimated to exist in 6-8% of the canine population (Canine and Feline Endocrinology and
Reproduction, Feldman and Nelson). It is a congenital anomaly which is described as a sex
limited (occurs only in males) trait. Current research provides that it is probable that
multiple genes are responsible for the condition of cryptorchidism. Dogs that are
ryptorchid should be neutered and any sire or dam that reproduce it repeatedly should also
be spayed or neutered.