I myself had been sneezing just as often if not even more so. It hurt after a day. Allergies are no fun. I took medicine for that. I hope the pet’s owner has come to his sense and taken care of poor poochie’s hypersensitivity.
Poor baby. I’m pretty sure it needs to be checked out by someone experienced with allergies.
But while you’re waiting for the appointment at the vet……
There’s a slim chance this is a learned behavior that is triggered by certain play activities. Test out my theory: Does the dog sneeze this way if you take it outside on the driveway and play in the same manner? If so, it just might be a behavioral issue.
Or it could be there’s something caught in the nasal passage that shakes loose when playing hard and causes the sneezing.