Bartleby has a growing (pun intended,sadly) array of these fatty tumors. We get them tested, they come back as lipomas.
It is squishy, and when we feel it, he doesn't indicate pain or even discomfort, and he's getting on towards 10, so it may well just be a lipoma.
There's a non-profit arts organization in my neighborhood that provides all kinds of arts/crafts events at no cost for kids and their parents -- it's geared primarily towards low-income families, but no one is turned away if they're middle-class. They do all kinds of projects and stuff, like painting and mixed-media shit, but also video projects and photo journals. It's pretty cool.
As a fund-raiser, they're putting together a dog calendar, and anyone can submit a picture of their dog with a short description the pooch, and then a "panel of judges" (I assume the kids) will pick 45 dogs to have their pictures in the calendar.
OBVIOUSLY we entered Kato, and this is the picture we submitted: [link] He NEVER does that head-tilt. EVER. I think he knew I was taking the picture for the contest, so he played up his cuteness. Sly pooch.