I have found out that keeping a pen clean using dawn anti bacterial soap everyday with a good scrubing on the floor will help with everything, dogs can eat a lot of nasty stuff and not get sick, being there saliva will kill a lot of nastiness ,but when the quanty of what they eat is more than there saliva can kill there gona get stomach problems, grown dogs can get messed up from eating nasty stuff very fast, seen it to many times , and have seen a vet diagnose a hound with kidney failure due to the the dog eating nasty stuff, that was a severe case of guardia, febendazol such as panacur, or safeguard, will wipe this out , 5 days of using it 1cc per 10 pounds