Got up too late and there was no time for walkies, so instead I played a little ball in the backyard with the dogs after the housemate left for work. Bear started sneezing violently and I could see the whiskers of the grass seed inside his left nostril, so I went after it with my fingers and luckily he is a very good boy and he let me extract it - it took half a dozen tries but hopefully I got it all out.
.