The Barbary Coast by Kiernan Kelly

Bear and Pride are leaving their home in the mountains, at least for a little while. Pride dreams of visiting the Pacific Ocean, so they’re off to the Barbary Coast, ready to see the sights in San Francisco.
While taking on provisions in Denver, they meet a man named Beckett who asks them to go on something of a quest while they’re on their trip. He wants their help to find a missing young man named Jackson Dower. The two men decide to look for Jackson, but they have no idea what they’ve taken on by agreeing to do the job. There’s a lot more to Jackson than meets the eye, and Bear and Pride are in for more than a few surprises.
Their search will take them across the prairie and the desert, to the most infamous city in the country. Danger lurks around every corner for Pride and Bear. The past catches up to them, Jackson poses more problems than they really wanted to take on, and Pride ends up wondering if he’ll ever be able to see that ocean he’s dreamed of for so long. Their journey will test their mettle and their love. Can Bear and Pride survive their adventure?