Most people are going to say it's terrible. And in general, it is a really bad habit to get into. But I'm not going to lie -- I share my plate with Jackson at the end of my meals. Luckily, he doesn't like much anyways (he won't eat toast, or chips, or fries) but any kind of meat I am eating (he gets half of my meatball, or some pieces of my chicken, or some bits of steak or hamburger, things like that) and I even share my ice cream cone with him
I do it in moderation... it's not like I'm letting him have the whole plate or the whole ice cream cone, etc... but in turn, he's a really bad begger, lol. But it honestly was inevitable having 2 young siblings who are always dropping food and/or giving it to him.
He is 16lbs and gets 1/4 cup of Acana kibble mixed with a tablespoon of wet food and same thing again for dinner. He is in great shape and very athletic.