We thought we might have a litter of puppies before we spayed but after one heat and doing research on the process of having a litter including the time commitment we realized that was not something we could commit to. So, after her first heat but before her second could come along, we spayed her. She did fine and is a calm, happy yorkie. We haven't had any negatives issues. It was a tough decision and a little sad but we knew we weren't prepared to raise a litter.