hound
獹 centers on a hound: a dog used for hunting. The meaning is specific to a type of dog rather than a general canine.
獹 combines the dog radical 犭 with 盧, which likely provides the sound. The character was created to represent a specific type of hound, but the exact historical development is uncertain.
The dog radical 犭 on the left hints at a canine, and the right side 盧 looks like a complex hunting trap or enclosure. Picture a hound trained to work around such a trap.
For ロ, imagine a hound with a low, rumbling growl: low -> ロ, and the hound's growl echoes as it hunts.