I have a 4 year old, 11lb Yorkie that keeps panting at night. It is like clock work!!! Every time between 6 and 7pm, he starts breathing hard. There are fans everywhere directed right on him. He is fine during the day, eats his food, alert, cuddles, wants to play and god for walk, etc. I took him to the vet and they told me he is fine and to "keep an eye on him". Has anyone else experienced anything like this? Any suggestions?