ive aquired a new guinea pig
, his (i hope and i think its a him) owners didnt want him and i said i would take him, he was free with a cage, when i went to collect him it was apparant that the poor mites cage hadnt been cleaned for at least a month, there was layers and layers of filthy sawdust. anyway after two days just settling in i let him on the grass with others about 1 hour ago, i know how males go on (i only have males), and they hump for want of a better word to show dominance, he has never been around other pigs and is about 1 and a half years old (or so I'm told), so i let this go on for a little while, well about 5 minutes, i dont think its very nice and he seems such a placid little thing, and horrible stuff is all over his back, iv tried to wash him but its solid, please dont say what i think this might be as i feel sick. ive tried to wash the poor thing and it wont come of, help, i used baby shampoo, is it what i think it is and what can i do and why did this happen,
HELP

HELP