When a dog is suffering from arthritis pain the dog will typically have trouble moving around, limp when walking or have trouble getting up off the floor or have trouble getting up on the couch or the chair etc.
The dog may also have Irritability or be more tired than normal and not want to get out and go for walks like it used too.
Other signs that your dog may be suffering from arthritis is decreased appetite and licking, chewing and biting around the pain areas.
If the dog begins to limp on one leg then the dog may have arthritis in that leg if the dog doesn't have any other sores in that leg or foot.
When your dog has arthritis you can give the dog some glucosamine-type supplements which helps with joint pain in dogs.