A Veterinary Medical Database search of the years 1982 to 1999 revealed that in
dogs with tumours of the heart, the relative risk for spayed
females was
over four times that of
intact females.
A study utilizing the Veterinary Medical Database of
over 40,000
dogs found that neutered males and
females were more likely to die of cancer than
intact dogs, especially of OSA, LSA and MCT [15].