Lucy
Source: Drop. Lucy was sent to Revendreth, as all cats are, and somehow escaped. When questioned, local dredgers blamed it on her being a cat. Undead type. Each zone / faction will have a daily calling quest that comes up from time to time called Training Our Forces.
Lucy is a companion pet obtained by looting 
Lucy's Lost Collar from a Dirty Glinting Object, which is spawned by a special covenant trainee during Training Our Forces calling quests in Shadowlands.
Guide awaiting review
Identify Your Special Trainee
Only a specific trainee for your covenant will spawn the Dirty Glinting Object: Venthyr players need Drippy, Kyrian players need Deos, Night Fae players need Twinklewings, and Necrolord players need Dregs. If a different trainee accompanies you, the Dirty Glinting Object will not appear.
Accept a Training Calling Quest
Wait for a Training Our Forces calling quest to become available for your covenant's zone, or one of the cross-zone variants: Training in Ardenweald, Training in Bastion, Training in Maldraxxus, or Training in Revendreth. Do not turn in the quest immediately — keep your special trainee with you to continue farming.
Farm the Dirty Glinting Object
While your special trainee accompanies you, kill mobs in the area to trigger the Dirty Glinting Object to appear on the ground roughly every 5 minutes. Loot the object each time it spawns, as it has a chance to contain Lucy's Lost Collar.
Learn Lucy's Lost Collar
Once you obtain Lucy's Lost Collar from the Dirty Glinting Object, use it to add Lucy to your pet collection.
Tips
If you are a Night Fae player and your trainee is Karras instead of Twinklewings, no Dirty Glinting Objects will spawn — abandon and requeue for the calling until Twinklewings appears.
Holding the calling quest without turning it in lets you keep your special trainee active so you can farm multiple Dirty Glinting Objects in a single session.
