Advice on dog not acting normal

Our 4.5 year old blue heeler went for a trail walk and went swimming in saltwater today. Ate dinner like normal at 7:00 p.m. He started pacing about an hour and a half ago, he would try to lay in a spot and then immediately get up and go to another spot, try to get comfy, then move again. Repeat. His nose is wet, his gums don’t seem pale to me but I can’t tell, I’ve checked his stomach for all the symptoms of bloat but I’m not a professional so I don’t know. His tail has been tucked which is unlike him. Should I take him to the emergency vet? What could be wrong? I’m stressed because as simple as it sounds, he never acts like this.