Your dog needs to be able to get out of the wind, rain, and sun at will.
(Your dog; needs; to be able to get out of the wind, rain, and sun at will) (Your dog; to be; able to get out of the wind, rain, and sun at will)
Your dog Your dog
needs to be
to be able to get out of the wind, rain, and sun at will
able to get out of the wind, rain, and sun at will