Hi Fugger's mom,
I have a few questions for you that you should ask yourself before you, or anyone, decides they want to start breeding:
Is your cousin's dog health tested?
Does he conform to the boxer breed standard?
Does his pedigree have any genetic health issues?
Does his temperment conform to the boxer breed standard?
Is he stud material?
You should first do research on what it entails to breed. Here are a few links that can get you jump started:
http://communities.msn.co.nz/TheBoxerInn&naventryid=130 (Great article)
http://www.geocities.com/pro_boxers/breeding.html (List of links for those interested in breeding)
Breeding is a serious issue, please take the time to thoroughly research breeding. There are too many unwanted and unhealthy pups in this world.