How deep is the hole? Squirrels love to dig in loose soil. They don't do any real damage.

That looks like a hole I just noticed in my yard also. Definitely not a squirrel diggin hole. It even looks like a hole going downward, and something actually dragged some lint to decorate around the door, similar to how it looks like something is decorating your burrow's door too.

I did try to drown it out but I don't know how far the burrow goes, or if the animal is even in there at the moment. I let the water run in for a bit but then stopped when it didn't seem to be filling up or when no animal was seen.

I thought it might be a rat since a mouse probably didn't need that kind of big hole entrance.

I had a huge toad in my Clematis bed that would burrow like that, then jump out when I watered. I finally moved him to the front bed where he couldn't do any damage. He still jumps out at me when I water, scares the puddin out of me everytime.

maybe a bunny?