He looks like Winston Churchill! :)
Nice brindle. Looks like he’s getting a bit chunky! Bostons love to eat. Great dogs.
My first dog when I was a boy was a Boston named Bobo. Bobo went everywhere with me, even to the beach and down to Mexico. A couple times I even put him in my newspaper bags and took him on my route.
I don’t know what advice to give. It wouldn’t hurt to get a second opinion. And enjoy the little guy while while you can.