Pet beds,

They can be quite annoying if you’re moving base, or have no space for them.
Solutions:
A config option or item, that performs the task of a pet bed, but more compact; causing pets that are clicked on with the item respawn at the players spawn point, or at world spawn if they don’t have one.

Entity cramming,

When you have hoards of pets, too many to count, it can be difficult to manage them, or keep them around yourself.
Solution: disable it, completely, configurable, or just for tamed entities.

Why am I reporting these two issues?
When using mods like the rats mod, it can be difficult to keep all of your rats alive and mobile, especially with turning up the rat sack capacity.

Please, this mod is great, but it could be greater.

-Lime