The current bottling has a strength of 9.4% alcohol by volume (their site gives a range of 8-10%, which makes me think it possibly varies by batch—or year). Here’s Anchor’s description:
Old Foghorn is highly hopped, using only Cascade hops. It is fermented with a true top-fermenting ale yeast. Carbonation is produced by an entirely natural process called “bunging,” which produces champagne-like bubbles. Our “barleywine ale” is dry-hopped with additional Cascade hops while it ages in our cellars.
Smell: Rich and aromatic, nicely fruity when I first opened it; sweet brandy character after that. Toffee, vanilla, maple, leather, lightly peppery.
Taste: Smoky wood and a touch of cherries; honey-caramel sweet and has that luscious brandy alcohol heat and sipping character. A bit cloying, a bit plummy, a touch of leather and perhaps star anise.
Mouthfeel: Think and syrupy and slightly sticky; eminently satisfying on the tongue.
Overall: Superb—balanced, mature, perfectly sippable, simply one of the best Barleywines out there.