snoring dog

When I pat my dog it makes a grunting/snoring sound repeatedly. Whats it doing?
My dog comes up to me wanting to be patted like any other dog but when I pat it it makes this kind of grunting or snoring sound. It also leans up againt me and does this. It stops as soon as I walk away. Its just kind of mysterious why it does this.
it starts relaxing and gets of his feet and rests his head on his shoulders which will close his throat a little and make a snoring sound because air is pushing through.
Snoring Dog
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