Hmmx, maybe you can get closer to him by having more interactions with him like playing fetching, pat-ing him.. Cause normally, when dogs are new to an evironment, they tends to be scared.. Does this dog owns any toys or his own pillow?
Btw, how long has the dog been staying at your house le?
http://www.canismajor.com/dog/older.html <-- found this.. hope it helps abit =)
Keep Things Stable: Older dogs may not like change. Don’t move his bed, shift his routine, or force him to adjust to too many new situations.
Keep the Environment Comfortable: A soft, warm place to sleep and protection from the elements will help keep your dog happy and healthy.
Be Patient and Be Present: Things may take longer and may be more challenging. Make an effort to provide the extra emotional support your dog needs by spending as much time with him as you can.
