I do not know about other animals, but dogs... I can sometimes smell cock (actually, the smegma) from 3 feet apart, but I've never found a "musky" smell in dog balls. And I've buried my nose on them.
There is some interesting fact, though, that a significant percentage of guys will NOT be able to smell musk at all. I *might* be in that percentage.
Sure is better than what most people smell like. Dog nuts don’t have much of a smell to me. Unsheathed rocket sure does though. If you keep them clean there isn’t much that is off putting.