Hello. We have a 21 year old Sulcatta that we adopted 1-1/2 years ago. Our boy Tank has been inside his nice house for 3 days now. Monday was cool and cloudy with a daytime temperature of 58-60. Had little sun. Tuesday and today, Wednesday was the same outdoor temperature with some nice sun. My main question, is it normal for them to stay all cosy inside their nice dog house thus time of the year and nor come outside during to get some sun? Normally he comes out with some sun but not the past 3 days. We live in Southern California. Thanks for your advice and expertise.