Apart from the crazy dog, the style has similarities to "Virgin and Child Surrounded by Angels" by Jean Fouquet[1], from a somewhat similar era (1452). If you search for "Early Netherlandish paintings" you'll find more, so it's not outrageous for the time. I'm sure people who know their art history (not me) can point towards even much closer ones.

[1] https://en.wikipedia.org/wiki/Melun_Diptych#/media/File:Fouq...