One thing I have found is that
all animals are unpredictable!! I don't think you can ever be too over-protective of your Yorkie baby. Their personality is so agressive while their temperament usually is not. They just want to be friendly and playyyyyy!!

My son has a very well behaved border collie and she is always the lady ... but ... she hates Toto with a passion!

I think if she had her way she would snap Toto in half!

I totally understand why ... she is as spoiled as any Yorkie on this forum!!

I believe I would just "proceed with caution". Stay close by without hovering and if you sense a problem just scoop little Hercules up ... that's the way I handle it with "Her Highness" Missy the border collie!! Have a great time and do let us know how Hercules handles his socializing!!