@HunLepto Guess, this problem calls for a scientifical approach.
Let's use this picture to get the approximate ratio first:
Considering the normal human is 0 and animal is 5, I would say, our girl is somewhat around 1.7, thanks to our friend
@N0Mi0 we also know that foxes can have up to 5 pairs of nipples. Now we need to approximate the number of nipples by linearly interpolating between 1 and 4-5 pairs. We get an increment of 1.6-1.8 pairs per step, so the ratio of 1.7 equals to 2.02-2.36 pairs of nipples.
My conclusion is that the particular species of anthropomorphized fox depicted in this chapter has around ~2.19 pairs of nipples. That means some of them will be born with 2 pairs and some of them with 3 pairs (very rare).
The answer is, our girl has two pairs of nipples (4 nipples in total).