>>Is it true that there is no way to have an intact dog in the house without it marking?
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With these guys it's very difficult to 100% house train them. It's not impossible to do it, but it is improbable. The amount of dedication to training is beyond what anyone I know is capable of.
Even my parents neutered male marks every now and then, and he was neutered at about 6 months of age. My grandmother's boy is worse, and her boy she lost two years ago (who was intact) was the worst of all of them.
So, unless you are 100% committed to showing then I too advise to have him neutered.
There are many great activities available for those with fixed AKC dogs. Rally is a great option with these guys, they love having the interaction. Many are also very good at agility, again, they love the interaction. These are happy and high spirited dogs, finding something that you can do with them that is also "play" really brings out the joy of partnership with them.
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tabitha
Kayo, Kahla, and Dante'