i was examining one of my guinea pig's fur yesterday when i noticed very small brownish specks in his fur where it is white. at first i thought it might be just reminants of poo that had been broken in half and napped in, but it seemed to be all in the same consistency. i checked for movement and they seemed to be moving, but it was hard to tell, as they were incredibly small. as i tried to remove them i had no trouble, which i had no trouble with, unusual for this kind of problem. i was wondering if this is a problem and if so, where can i get invermectin to treat it?