Thanks girls Special thanks to em- I try not to Google because I usually end up scaring myself, so it's nice to have someone filter in the useful info without the scary stuff

I was just on the phone to my mum and had a brainwave- ds spent most of yesterday afternoon rolling around on the buffalo grass in our front lawn, something he hasn't had a lot of contact with before. So it's possible it was the grass as well (i noticed a few little spots on him last night an put it down to the grass). But probably better to keep allergic to pencillin on his record- better to be safe than sorry.

Thanks again