Well the day progressed better than I thought. While Ranger was definitely more quiet and moody than normal, he did go out and play with his doggie brother, run and fetch. He just was not that interested in morning or noon meals.
He also had not pooped ALL day (except in the morning). Which is not normal. By dinner time he was excited to get his food, I added a spoonful of yogurt in it to help with digestion. He ate everything. And then went and took the biggest...well - you get the picture.
Going to watch him closely. Seems all is well for now. Thanks for your posts!