No Invisible Fences. They do not keep most Pyrs in and they do not keep people or other animals out of your yard. Pyrs are guardians by nature and could take the intruder as a threat. This is not a Golden Retriever. it is a Great Pyrenees. www.gpcaonline.org.
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You'll receive a copy, too, at to help you keep track of which pets you've inquired about, and which shelters and rescues you've emailed.
NOTE: Some shelters have physical locations you can visit; some of these shelters may only have pets for a limited time, so please do not wait for a reply—just go visit the shelter! Other organizations are rescue groups run by busy volunteers who may take a while to reply. You can find information about the shelter or rescue group caring for this pet, and their adoption procedures, on the pet's details page on Adopt-a-Pet.com.