Dog Or Mountain Lion?

My foot is next to the paw print of some pretty big animal. What kind of animal?

Same print, with my phone to provide scale.

Thanks to Berkeleyside.com for these comparison drawings.

This one was pretty big too, but not as deep. Looks like a dog print.

Here’s the power line terrain where we walk the dogs.

Those big tracks were on this road.

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Scat with fur. There’s a lot of this on the trail. Probably coyotes.

So, I don’t know what kind of large & heavy animal left the topmost prints. Do you have an opinion? I’m hoping it’s a really big dog whose human didn’t leave any track at all.