Some dogs circle before lying down to rest, which is completely normal. If your dog is doing it at other times, it could stem from boredom. Make sure you are leaving a tv or radio on when you leave the house and also make sure your dog is getting adequate exercise and stimulation. Brain games like puzzle toys are also a great thing to try.

You can switch your adult dog back to puppy food which has a much higher fat and calorie content. It really helps an underweight pup gain weight fast. You can also add coconut oil and peanut butter to your dog's food, both of which are high in calories.

Golden Retrievers like all other dogs should have a well balanced diet that includes protein, fiber, fruits, vegetables, and all necessary vitamins and minerals. Do your research on dog foods to find the proper one for your pet. Avoid by-products, corn, wheat, fillers, and any other unnecessary ingredients. I have five dogs who love and absolutely thrive on V-Dog. Good luck on your food search!

That's a very serious problem that could easily lead to tooth damage, intestinal blockage, and many other health problems. The above answers are very good possibilities. It could also be an issue with your dog not having the proper stimulation of chewing on things. One of my dogs will search for really hard items and has in the past chewed on them until his mouth has bled. I suggest after first having your dog seen at a vet, taking the rocks away when you catch him and immediately replacing them with a proper chew toy. Nylabone's are hard plastic bone shaped toys that are for strong chewers, but even something as simple as a stick may be a good distraction, as long as your dog doesn't swallow the stick pieces. And I also suggest trying mind stimulating puzzle games to get your dog engaged and thinking. Hope everything works out for your pup!