Does sound like grass seed, but alot of dogs with largepaws are prone to this, esspecially bull breeds. My Bully gets them all the time. Try and squeeze out as much as you can. If you can get Hibi Scrub (you can buy from ebay) and wash feet in this, once dry use sudocrem or Fuciderm ointment if you have it (normally get this from the vet, its great). It