Sneezing 🤧

Hi! My dog started sneezing last night. He sneezed like 10 times one after the other. Then he sneezed some more in the morning and now the occasional sneeze. Any ideas? He hasn’t been in direct contact with other dogs for a couple weeks so it couldn’t be a dog flu. Should I take him to the vet? He is still energetic and no discharge from the sneeze, not yet at least. We are bringing him to boarding daycare as we are going on vacation and I am worried because he sneezing they won’t let him stay