What is the temperature outside vs inside? Could just be the temperature change. My Harlie's nose seems to run occasionally and I just asked the vet about it this week. She said as long as it's clear then it should be fine and not to worry about it. If it changes color or seems thicker, then it can be an issue.
My older dog's nose will also run at times when he is running and playing hard.
Could also be some sort of an allergy to something outside as well.
Has it stopped? How is he acting since then? |