According to ABC News (as reported on Google), this story has a grain
of truth. Although the mouth of a typical dog is full of bacteria, it's
"species specific." So, if a dog were to lick a person, most of the
germs wouldn't transfer. "Bottom line -- you're more likely to get a
serious illness from kissing a person than kissing a dog."

A dog's tongue is constructed with layers of scraper cells to get rid
of dead tissue so wounds heal faster. So you shouldn't be afraid of
licks. A dog's kisses might be gross, but they're not as dangerous as
that of your spouse.