Here are some pictures of Nico and Desi. Nico is the all black one; his new to us brother Desi is the black and tan/silver one. They are littermates. Both are 5 months old, although Desi weighs 3 pounds more than Nico and looks a lot older to me.
Desi weighs 11 pounds and Nico is 8 pounds. The other two pups in the litter that I've kept track of are a sister who is 10 pounds and a brother who is nearly 11 pounds. Nico was the runt of the litter.