I noticed something about 5 days ago. My beagle shakes sometimes as if he's cold. I'm not sure what this could be, he eats/drinks normal, and he has the same energy during playtime and his daily walks. Other than the 'chills' everything is great. I have an appointment set for next week(soonest they could see him due to weekend), has anyone had a similar experience, or could you please offer some input that may calm my nerves?