Happy Birthday to your Min-pin!
Thanks for the info, it was very helpful!
Dogs have a far superior nose than humans do, of course, so they are very sensitive to scents. I believe he's reacting to the perfume, which is possibly still on him, causing him the squinty eyes. You can try wiping him well with a moist warm towel (just water) to see if that will help. Run it over him a couple of times, especially whereever he was hugged. If this doesn't help you can give him a bath.
Your pup might also have teary eyes from seasonal allergies. Yes, dogs can be allergic to pollen, dust and even humans! Keep an eye on this if the case persists.
I'm pretty sure the strong perfume is the culprit. Make sure to use very mild shampoos for your dog, and light smelling cleaners or scents around the house. As your dog has had such a reaction, it's a sign that he's sensitive to these things so best to keep it out of his way.
Other than that your baby does sound like he's doing great and enjoying his birthday!
Please let me know if you have any other questions, or if I wasn't clear on something. I'll be happy to help!
Best Wishes,
~Olivia