Dog food is designed specifically with a dogs dietary needs in mind.
Dogs have short gastrointestinal tracts and sharp and pointed teeth which are suited for the consumption of meat. Therefore many dog foods include meat in them and include other nutrients required to keep a dog healthy.
Dog food can vary from biscuits to chunks of meat and also dry kibbles.
So can gerbils eat dog food at all?
No, they should not be eating dog food at all.
Dogs have specific nutritional requirements which are quite different than that of a gerbil.
Therefore their food should be separate and not shared.
Make sure your gerbil does not eat dog food.