I don't really know how long this has been going on as he typically sleeps in the living room and keeps to himself when I'm home, but our other dog
passed away last week and Jake's been sleeping in the bedroom with me, and now I noticed it. Since last week I've also been taking him to work with me, we're basically together 24 hours a day now.
During the day he's breathing fast and hard. Hard enough to rock his body when he's lying down sometimes.