to EBN. My first thought is that it's just the pigment of Obi's skin. Lots and lots of bullies have what I call poke-a-dots. Wilson's full of them, even on his underbelly. As Obi gets a bit older his colors may start changing a bit, the browns may get darker or lighter. Wilson pulled some black that mixes in with his red along his nap, sorta like his color fades into the white. I'm sure others will be along soon, but it's probably just Obi getting some dots.
PS....Obi's a cutie!