Not Jeff, but I fixed Jack when he was 4. He was a typical boy and I had problems with him marking in the house. Being that he was the low dog on the totem pole in the house, he took the opportunity to pick things (when I wasn't looking) to mark as his. I'd catch him, have a stern conversation with him, and we'd be fine for a few months....then it would start up again.
Since he was fixed, THAT has stopped. He also tends to empty his bladder when we are outside vs. one spritz here, one spritz there.
Now we have the same problem with Grizz, but he can't lose the testicles until I am done showing him.