[YorkieRose]

There are breeding conditions that promote worms and is in a high volume kennel. Most small breeders who keep their dogs in the house, or a dog area in the house, not on concrete or dirt runs will not have parasite problems. My Yorkies stayed on solid sheet tile flooring like in hospitals..easy to clean, no grooves/grout/dirt for parasite breeding.

PS...I wrote this before the last response...
My Yorkies went outdoors on grass also..but the yard was treated twice yearly.