If I adopt a dog from a animal shelter and it has it shot can the dog contract parvo from a dog I had a month ago?

Yes it can.

If it is an adult dog and it up to date with vaccines, the risk is very low, but still possible. Parvo can live in soil, and in your home for a VERY long time. I hope that if you are considering another dog, your home and garden has been thoroughly cleaned and disinfected with bleach. I hope that all of the previous puppies bedding, leashes, collars, toys, water and food dished have all been thrown out. I hope all feces has been removed fro your yard, and your house has been thoroughly, and I mean thoroughly disinfected with bleach.

Parvo is a virus, therefore it is always mutating. Chances are low with an adult dog that has been vaccinated, but because it's a virus and not predictable, there is still a chance your new dog could contact this disease.

Coming from a shelter has some risks. The shelter has a lot of disease that comes and goes. The dog you may select may not ever get sick, but can actually be a carrier of any of the diseases from Parvo to Canine Influenza to run of the mil kennel cough.

Make sure that your dog is up to date with all its shots. When purchasing from a shelter, the dog you select should be up to date with its shots also. Ask the shelter employees if their kennels came down with anything. You do have a right to know, especially if you are adopting one of their animals.

There is no safe guarantee from adopting from a shelter as far as avoiding any type of illness.

If your dog is an adult and lives a pretty stress free life, the likeliness of your dog actually getting sick is very low. However it still can happen. Its is very rare that adult dogs get Parvo, but it does happen.

A safer avenue would to be going through an actual rescue.. A private organization (some are 501c3). Typically the dogs are in foster homes. Dogs that the rescue pulls from the shelter go into qurantine for a period so any type of illness the shelter may have won't be spread throughout the rescue or the new home. Pet adoption: Want a dog or cat? Adopt a pet on Petfinder (http://www.petfinder.com) is a good place to find a rescue (not a shelter) in your area. You can also Google search a rescue in your area.

Good luck