is it hard to get rid of giardia. How should i get rid of it in 3 german shepherds and how did the new pup get this we brought home

Hello, it can be challenging to rid giardiasis from a household especially when multiple dogs are affected. The best recommendation would be to treat all 3 dogs, at the same time, until you have 2 negative fecal samples. You should retest the fecals 10 days after initiating treatment for giardiasis and 10 days in-between testings. However, the most important part of this is to reduce environmental contamination, because as though you may successfully rid your dogs of giardia, they can become re-infected at any point. Treating the environment means you have to pick up their stools immediately after they defecate and you must wash the areas where they defecate with water and bleach. Most infections occur via a fecal to oral transmission. So at some point your puppy may have been exposed to giardia, then came to your house and started shedding the giardia onto your environment exposing your other dogs as well. Please wear gloves and wash your hands after cleaning as giardia can also infect humans. Best of luck and hope this helps.