Jess,my 10 month old yorkie,gets this ALOT.It all started a few months back,the smell would come and go every so often,she would also lick her self alot when this smell apeared so I thought she had an infection or something.But after a vet visit we were told that it was her anal glands
They werent full or swollen,she just had a discharge every now and again which I was told is quite normal and nothing to worry about..but it DOES smell awful
She cleans her self when this happens as the discharge is very small,but even so,the smell really bothers me and we try and keep her from kissing our faces on these days..lol.