Rosanne
Hi Huck, how do you come to the idea that Sforza did not use the Dog by pine tree before 1462? In the Fountain in the wall in Sforza Castle, that symbol was put on the fountain 1452 (apparently) before the internal courtyards were improved. The wall fountain was the domestic water supply of the Visconti and you can see the Visconti symbols underneath. Do you have different information?
~Rosanne
~Rosanne