Most pooch parents have heard that dogs should be neutered early, before they reach sexual maturity at 6 months of age. But the decision could become a lot more complicated.

Researchers examining the health effects of early neutering on Labrador and golden retrievers found that male and female Labs neutered before 6 months of age are at double the risk of joint disease, while goldens, especially males, are at a stunning four to five times higher risk.

When the risks of four types of cancers were also examined, the results were a little different. Early neutering has little effect on Labs of either sex or on male goldens. But female goldens neutered after 6 months of age have a sobering three to four times greater risk of developing one or more of the cancers.

Non-neutered dogs face health risks too, so ask your veterinarian for advice.