Dog biscuits as you can imagine were especially designed for dogs and their dietary needs.
You can think of them as similar to humans and their snack food but as a dietary supplement.
Usually they come in a flat bone-shape and tend to be hard in texture and dry.
Often many of these dog biscuits claim to help with oral hygiene as well.
So can gerbils eat dog biscuits?
No, they cannot eat them at all.
As mentioned above dog biscuits are made specifically for dogs and their diets and their nutritional needs.
The nutritional requirements for a gerbil are much different and therefore gerbils cannot eat dog biscuits.