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Parvo is extremely contagious, which is one reason it is such a difficult disease. Your dog can remain contagious for as long as 2 months. Make sure to isolate your infected dog from other dogs in the family if possible, and keep him away from public spaces while he is still contagious. Even vaccinated dogs can still get parvo, so it's best to keep all dogs separate.  Parvo is mainly passed through feces and fluids passing from one dog to another. It can even be passed by your dog sniffing another dog.  If you have other dogs in the house, make sure that your sick dog is using the bathroom in a different area from your other dogs, as your dogs can catch it from the sick dog's feces as long as 2 months after the symptoms have passed. A dog's temperature usually runs between 101 and 102.5 degrees Fahrenheit. Use a dog's rectal thermometer to take your dog's temperature.  Add petroleum jelly to the end. You can use another type of oil, such as baby oil, if you don't have have petroleum jelly. Insert the thermometer into the anus, going in about an inch. Go slowly, and be gentle. Digital thermometers should give you a reading in less than a minute. If your dog is too cold, you may need to warm fluids before giving them under the skin. You may also need to provide a heating pad. Just be sure to provide protection from the heating pad, as your puppy could be burned if he is directly on it. Use a thick towel or blanket between the dog and the heating pad. Once your dog has stopped vomiting and shows an interest in food, start with bland food. Skip the kibble for now. Instead, try very lean ground beef boiled with rice (be sure to skim off any fat) or cottage cheese. Yogurt is also a good option. Ask your vet for other options. Mix 30 parts of water with 1 part bleach. Use that mixture to sanitize hard surfaces in your home, especially ones where your dog has been. That will kill the virus but only on hard surfaces.  For other areas, such as carpet and couches, wipe as clean as possible, and then get them steam cleaned. You might also consider quaternary ammonia for cleaning soft surfaces. For outdoor areas, the best you can do is pick up any of your dog's feces and water the yard a bit more often. The dilution can help lower the amount of virus in your yard over time, and the sun will also kill some of it. Once your dog has stopped showing symptoms, give him a bath with antibacterial shampoo. Repeat in a week.  Make sure to let the shampoo sit for at least 5 minutes so it can work. Also, ensure you keep your dog warm while bathing by using warm water and warm towels when he gets out of the bathtub.
Isolate your dog. Check your dog's temperature. Feed your dog bland food. Disinfect the your home. Bathe your dog.