Thanks so much for all the well wishes, they really are very much appreciated
I'm pleased to report that they worked and Riley is back home
The vet rang and said he hadn't been sick at all since he'd been there and other than a fast breathing rate seemed fine. She said there was a big strand of grass in the carrier mixed in with mucous that he'd chucked up on the way there and she reckons that was caught in his throat. He did throw up on the examination table a few times (including one very large puddle on the floor
) so they can see I'm not a hypochondriac... hopefully!
When I collected him the vet showed me the strand of grass and compared to his usual 'output' it was actually quite small! So it seems that the grass munching was indeed the culprit, normally he munches on it then chucks up and bounces back outside to play but this time it seems to have got stuck on the way back up. When I cleared up the 'poo' it was in fact grass blades covered in a poo coating!
Here's a few pics of him taken earlier today just a few hours before his yowling/vomiting/panting/pooing episode