Is this grub damage?

last month

I started noticing small holes all over my yard. It almost looks like my lawn was aerated. The one spot I pulled up and the grass just lifted right out and had no roots. I saw one grub under so, I'm thinking grub damage? But, what's with the holes? I have a squirrel that's constantly digging through my yard but I don't think they make small holes like the ones in the picture.
Any idea what could cause the holes? Also, just to be on the safe side, I decided to put down the lower rate of triazicide if it I do have grub damage.

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