It really depends on how they look. If they're really ugly you'll probably only get a few moonstones for them. But if they have nice desirable color combos then prices can go through the roof.
This coming from someone who just bid 6500 ms on a gorgeous pair in auction. :V
Oh wow I went to see which wolves you were talking about and they are gorgeous 😍 I wonder how they got two of similar colorings. Are the colors always random?
The colors are always random yes :) it is likely the user campaigns for wild wolves very often, or that they used the Besprinkler item to re-roll the wolves colors until they got both those colors. I can't imagine the effort and moonstones and time it took to get two so close!