A Great Pyrenees dog can jump as high as 5 ft to 6 ft.
My own Great Pyrenees Jumped a 6 foot tall fence so I had to increase the height of the fence to 8 feet to keep him from jumping the fence.
Also dogs including Great Pyrenees dogs can dig out from underneath fences so I buried fence wire a few feet below the ground too.
A Great Pyrenees dog can live outside as long as the weather is not too hot or too cold.
If the weather is too hot or too cold then the Great Pyrenees dog should be inside the house out of the cold or hot weather.
In the heat the Great Pyrenees dog or any other dog can suffer heat stroke and get severely ill or even die of heat stroke.
In the cold weather the Great Pyrenees dog or any other dog breed could freeze to death.
I had a dog that got outside and lost and the next day I found him frozen to death near my garage.
I wish I could've found him before he froze to death but I could not.
If it's too hot outside for you or too cold outside for you then it's the same for the dog whether it's a Great Pyrenees or any other dog breed.