My dog only has 4 nipples.

OnionSoup thought this was worth mentioning said

So my dog was asking for a belly rub today and I noticed for the first time she only has 4 nipples. I thought, “that’s odd,” and went on a nipple hunt, I was sure she should have more than that… No, only 4.

I Google “how many nipples do dogs have” and find a variety of responses but most seem to indicate 8 to 10, with one site saying “as few as 6 in small breeds”. She’s 60lbs, so not small… Good medium sized dog.

How weird is this? (not that I’m counting her nipples, but that she only has 4). Anyone else out there with dogs that are quantitatively challenged in the nipple department?