Ddog was outside in the snow (supervised the whole time) and started uncontrollably sneezing. We brought him inside immediately but over an hour later, he's still sneezing like mad - he'll be ok for a minute or two, and then maybe 10 sneezes in 5 seconds, repeat. He couldn't even get through his dinner without 5 or 6 sneezes. I can only assume something has gone up his nose, though wouldn't be grass seeds etc at least, thanks to the snow! What should we do? Not easy to see a vet with covid and this snow, so can we try to flush his nose ourselves? Any advice would be appreciated.