Does it always work? I have a 10-week-old doeling that I found in the bucks' pen about 3 weeks ago. They had managed to tear a hole in their fence, and she squeezed through it. They didn't seem interested in her, but after I got her out she smelled like buck, so I know she did come into contact with the boys. I don't know how long she had been in there because I wasn't home. Anyway, I ordered lute, and it just came today. I plan to give it to her tomorrow. Can I be 100% certain she won't be pregnant after she has the lute, or does it sometimes fail? I'm still undecided about whether I want to keep her or sell her, and I would hate for the new owners to end up with a pregnant 7 month old doe on their hands.