My rottie pup, Duke, is a "talker"
Duke is 7 months old now and is very well behaved, but he "talks." He growls, grunts, moans and makes all kinds of noises all of the time!
It isn't aggressive growling, but a strange sort of communication. It freaks some people out, but it is truly harmless. Do you have any experience with this?
Absolutely! Rottweilers are well-known for this vocalizing... it's actually just one of the things I love about this breed.
Not all Rotties do it, but most do to some extent. I think of it kind of like a cat purring, it's just their way of showing appreciation, enjoyment and so on. It's definitely not aggressive in any way, but people who aren't familiar with the breed can be confused and worried by it.
Just enjoy it as part of Duke's Rottie personality and explain to other people that he's 'purring' :)