For cancers other than those three, the incidence of cancers included in the study were higher for
neutered than intact dogs.
For both male and female Rotties spayed or neutered before one year of age, there was a one in four lifetime risk for bone cancer, and the sterilized animals were significantly more likely to develop the
disease than intact dogs of the same breed.
A paper on CCL found that, across all breeds, neutered males and females were 2 to 3 times more
likely than intact dogs to have this disorder [15].
It might also be helpful for studies regarding joint diseases to evaluate whether or not there is a correlation between activity levels in neutered and intact dogs; i.e. do more neutered dogs participate in dog sports such as agility and
flyball than intact dogs, increasing the occurrence of joint disease?
SPAYED vs INTACT: In fact, the incidence of all cancers in spayed females was 6.5 times higher and in neutered males was 3.6 times
higher than intact dogs.
According to the Georgia study, spayed and neutered dogs are dramatically less likely to die from infectious disease, trauma, vascular disease, and degenerative
disease than intact dogs.
For example, a more recent study from the University of Georgia shows that neutered and spayed dogs live 14 % and 23 % longer, respectively,
than intact dogs.
Spayed and neutered dogs were at less risk for early and congenital conditions (aortic stenosis, early onset cataracts, mitral valve disease, patent ductus arteriosus, portosystemic shunt, and ventricular septal defect)
than intact dogs.
Neutered dogs were at less risk for early and congenital conditions (aortic stenosis, early onset cataracts, mitral valve disease, patent ductus arteriosus, portosystemic shunt, and ventricular septal defect)
than intact dogs.