New study shows that spayed & neutered dogs live for longer and die of different diseases compared to entire dogs
It was just last month that I wrote a blog here about the pros and cons of the decision on whether or not to spay/castrate your dog. This seems to be an area which is coming under increasing scrutiny by researchers, perhaps because it is relatively easy to analyse stored data to discover differences between spayed/neutered and entire populations. After all, the contrast between two study groups doesn’t get much more black and white than that: spayed/neutered or entire.
In one of the most recent studies (published online in April 2013), the historical records of over 80,000 sterilized and reproductively intact dogs were examined from a database of dogs presented to North American veterinary teaching hospitals over a period between 1984 and 2004. The cause of death and the lifespan of each animal was noted. To make the data as “clean” and unbiased as possible, the researchers removed around half of the records. First, they took out all young dogs, and all those where the spay/neuter status had not been recorded. Then they took out all those dogs that had died from congenital disease (i.e. disease which the animal had been born with, which obviously could not be influenced by neutering). Finally, they removed all of those dogs where no specific cause of death could be categorised. This left them with 40,139 dogs for analysis of the relationship between the effect of spay/neuter on age and cause of death……..