Studies show that in the last few decades we are seeing a significant increase in frequency of autoimmune diseases, which is quite alarming. (fitnessandpower.com)
Whatever the cause, veterinarians and others have noticed that all these problems increase in frequency in neutered pets. (2ndchance.info)
Many veterinarians recommend neutering sooner, as behavioral urine marking increases in frequency as the male puppy grows older. (gopetplan.com)