Blender mesh missing loop I am newcomer to Blender and modeling in general. Currently, I am working on modeling a cat. I am noticing at times loops are missing from the polygons.

Here is an example:




Is there any easy way to fix/add a line for consistency and what is the best approach to avoid this when modeling in general for consistent topology?
Edge Loops are not missing, it is expected behavior, it's an optimization done by Blender for faster viewport drawing.

If an edge angle is not sharp enough to be considered an actual corner it is not drawn in object mode unless you tick the option Draw All Edges under the Properties Window > Object > Display

If you have a Subdivision Surface modifier on your object, the Optimal Display option may also cause some edges to appear to be missing.