Week before last I Beaphar-d the house.  Followed the instructions carefully, but it still made half the dogs ill and 4 or 5 have been reverse sneezing.  It's mostly stopped now, but poor Phoebe's is just getting worse :-(  She's having bouts of it and getting a bit upset with it now.

Vet trip on Monday if it doesn't stop, but I wondered if anyone has experienced this before or has any ideas what I can do in the meantime?

Try Piriton?