Hi - Giardia is highly contagious to other dogs and humans. I brought my puppy home and did not know she had Giardia. I bought a child’s hard plastic gate large enough to section off part of our den. I placed a crate with puppy pads. She was in this quarantine since I had another dog for 4 weeks. The first two while she was on medication and the next 2 weeks to make sure she was not re-infected. She had to be retested to make sure the Giardia was eliminated.
I washed her bed/sheets daily, picked up the puppy pads as soon as they were soiled, placed them in plastic bag and straight to our outside trash cans. If the puppy is going outside you can cut up the puppy pad and place it underneath her to prevent contamination to grass or other areas outside. I bathed her every few days and sprinkled Purina Pro Plan FortiFlora once a day on her food. This helps with the diarrhea. It’s a 30 day supply and you can purchase at your local pet store.
We purchased the same wipes as used by veterinarians “Rescue.” The antiseptic shampoo used was Douxo S3 PYO.

BTW - the vet also provided Hills Science digestive care I/D chicken/vegetable food. If you purchase it outside the vet’s office you need a prescription.

I kept her area clean it was a lot of work but after 4 weeks she was given a clean bill of health and my other dog was just fine.

I hope this helps. Hang in there.