No, it's not. Yes, it is a guy persuing another guy but it's not like that... at least not to where its been translated. You never know with these things. Like Kuroshitsuji, it started out as a yaoi but quickly turned into the adventure story it so awesomely is. :)
Also, if it were BL it would state that it is.
The way to tell if the manga is yaoi from the front cover is if it looks like the guys are in a sexy, and beautiful (artistically from a photographers point of view) position.
I see. Im like this because of some "accident" with mangadex tags before. for a normal dude like me, yaoi is hell to my eyes. so, hell no. im not gonna go thru that shit again.
His love for his master is that of a dog's devotion. I was confused at first but after seeing him with his brothers... oh yeah.. total puppy... he's a dog. and I am here for it