The type of jacket mattered: his sleeved, fleece Climate Changer collected uncomfortable snowballs inside the chest, while his athletic-cut Kurgo vest jacket kept him warm enough and didn’t trap snow. If you’re using a sleeved jacket, make sure the sleeves and chest are tight enough to seal out snow.
There was absolutely no grass to be found on the departures level of LAX, so he refused to pee before check-in. LAX does have grassy dog relief areas, but they’re inconveniently located on the arrivals level, which has gardens and trees across the street anyway. Fortunately, he ended up being fine despite the missed potty break. He had to pee badly enough upon arrival that he was willing to use a light post outside, but not until we had walked up and down the terminal looking for grass.
For the return flight, we actually found a nice small patch of grass on the departures level at HHH, so he had a chance to pee before we checked in. Since we’d just come from a short hike in hot weather, I offered him small quantities of water regularly throughout the flight. Despite the extra water, when we arrived at LAX he wasn’t desperate- he waited until we crossed the street to a small garden outside the parking structures.