First let me say thank you to everyone who replied. You're experience and advice means a lot to me and has been really informative and lead to some of the funniest Forum related quips and reply's I've seen in a LONG time!!! (no pun intended, ok maybe a little bit intended lol)
The process from what you guys have been describing does seem quite invasive and I truly don't believe a cat or dog (or even a human for that matter to a lesser degree lol) should ever be put under unless absolutely necessary, such as for surgeries. I'm pretty sure I read that there had been 2 documented F3's that were fertile and maybe a dozen or so F4's. But I would think you guys would know about them if they were more than just rumor, so maybe what I read was just hearsay or later proven to be untrue such as maybe sharing living quarters with a fertile male of different gen etc. I agree with you guys, he definitely needs to be snipped at this point before he starts exhibiting other behaviors associated with an intact male. Until now it's just the yowling, but this evening he started doing the face/cheek rubbing onto inanimate objects and other less desirable behaviors can't be too far away if I wait much longer and I certainly don't want to get to that point.
As for why I would think he may be fertile? I guess realistically there's nothing that would make me think that he, more so than any other F3 would be, probably just wishful thinking. I love this little guy, he's got beautiful "Type" from everything I've learned and more importantly carries such an amazing personality that I'd love to see him be able to pass on his traits if possible.
Brigitte, the little guy is hung like a Clydesdale in relation to his size, er, I mean,
well developed?

So at least from what you wrote about being well developed, yeah I think he has that covered. Excuse the picture, I swear it's science and not pornographic hahahha
I think I'm going to talk to my vet tomorrow and ask what he says. He used to own a Serval and is very aware of Savannahs and their idiosyncrasies. But I don't want to do anything that could be harmful to Shelby, even if it's with good intention.
Patti, That's a great idea to contact Dr. Murphy to see if he wants them in order to be able to help understand SV's a little more. If he's interested, then I'll probably do that if it could help us understand SV's biological underpinnings better.
Paige, yeah time has FLOWN BY!!!! OMG, I can't believe Shelby's almost a year old already! Ideally I wanted to do it when he was about 7-9 months, but they went by so fast, I blinked and they had passed already.
John, Rascaldad and Deborah, OMG you guys are hilarious! I vote John SVCC comedian of the year and we're only in February, can't wait to see what the rest of the year has in store hahaha
Thanks again for your guys replies. SVCC THE BEST sv related site on the web!