When we bought Eliza she was in a paddock next to a stallion who I have now found out was notorious for getting out and impregnanted anything within a few km's.
This got me thinking and doing a bit of googling to see if eliza could be pregnant and maybe that is why her belly is sensitive to grooming.
So I've taken pics of her teats/utter and belly for you all to cast your eyes over. I can't say I've ever looked at a horses teats before but it does seem a bit big? Or is she just fat? You can see from her belly pic that she isn't keen on me grooming that winter coat out (despite daily brushing).