I apologize in advance, but I can only recommend the noble, loyal and highly intelligent German Shepherd, because there is simply no other dog.
They also usually weigh in just over 10 lbs, so should be a perfect fit!
A ten pound Shepard???
Some sort of dwarf?
A micro-shepard?
Remember - dogs are individuals and do not necessarily conform to the breed standard.
My German Shepherd never barks, is usually well-behaved and housebroken.
Of course, generally I would agree. A good Shepherd really is the best dog, period.
And there ARE Shepherds who are genetically defective with dwarfism. So, it could happen....