I have just noticed this on my dog. I know we get ticks in our garden as we have lots of visiting wildlife . Does this look like the red ring of Lymes or could it be a sting ? It is swollen in the centre, and paler. She is occasionally biting at it, but I have not seen a tick on her this year, and she hasn’t been distressed today. Could have happened a day or so ago, as I don’t always see her tummy.