Hi. Sometimes dogs just do weird things but I'd keep an eye on him. Again, it is probably nothing but my sister's dog woke them at night, wouldn't settle down and was panting. The issue was with their dogs lungs. He needed help from the vet. So, if this behavior continues, I'd have him looked at. Since dogs can't tell us what is wrong, sometimes we have to ask for analysis by vets to help. So, observe and don't hesitate to go. Here's an article on dogs having trouble breathing: https://www.petmd.com/dog/conditions/respiratory/c_dg_dyspnea_tachypnea_panting. I always look at tongues too. If it is nice and pink, great. If it is bluish in color, they may be having trouble breathing as well. Anyway, let us know how your dog is doing!