My puppy is eating rocks. Why do they do this and is it dangerous?

Puppies absolutely do like to get into things they shouldn't, as frustrating as this can be. Exploring their environment, including rocks, is in most cases a normal developmental stage.

To keep Atlas safe from the possible harmful effects of eating or chewing on rocks, such as broken teeth or intestinal concerns after ingestion, such as blockage, try to remove rocks from her environment as much as possible.

One reason why puppies are known for their destructive or explorative tendencies is they are in need of more stimulation, or experience anxiety when separated from you. There currently are several toys on the market which will interact with Atlas and release treats, that can be used while you are out. Atlas also possibly benefit from plenty of exercise, as well as puppy socialisation classes.

Though less likely, there is also a possibility that Atlas could have something else wrong that causes him to seek out strange foods. For instance, metabolic disorders, parasites, and vitamin deficiencies can all be underlying causes. In order to rule out these causes a trip to the veterinarian would be needed. The vet would check on the parameters of Atlas's blood, and check a fecal sample for parasites.

Hope that was a helpful answer! Warmest regards and best of luck to you both