I wonder if anyone knows where to find it...

it's of Renamon breast-feeding Rika, but Renamon in the pic had her breasts low down her body like a canine.

I'm sure I've seen it on this site, but when I look for it now I fail to find it.

If it was here,then what most likely happened is that the artist asked for it to be taken down. You might try FA, a lot of stuff that gets posted here comes from artist galleries over there.

It appears as though we do not have it. I searched pretty thoroughlyand turned up with nothing. Like ikdind said, I'd try FA.