No pressure

Something pretty common with older dogs, especially those that have spend significant time outside on the cement is the occurrence of pressure sores.

Like any existing injury, should it change or the pet start paying more attention to it, it's best to check in with your vet.

The best way to deal with them, is to avoid them altogether by giving your old pal a softer place to lay on outside.

Here's an interesting article I found on the topic:
Heal Your Dog's Elbow Callus