I have been owned
by yorkies for 15 years now...None of mine have ever smelled or had any bumps on them!!...Yes they can be destructive at the puppy stage but thats true for any breed of dog not just yorkies.
And if your yorkies ears smell bad, thats a sign of an ear infection and I would get to the vet.
If a Yorkie smell bad and has bumps on them, its a medical issue or Diet and needs a Vets attention as well.