[Sansano]

I would definately consider a female first since you have a male already. If you insist on a male then please insure you build a kennel run which will allow you to keep the dogs seperated if you need to. Also, why do you want to add another dog so soon? 6 months is way too quick for adding another. I would suggest to wait until the first pup is at least 2 years old. Rottweillers need loads of time spent on them in their early formative years and adding another dog this quick will take a lot of that away from both dogs. Taske your time. Fully train and bond with your current dog. Then add another. Good Luck.