A pet title should name the animal, the product, and the benefit without drifting into medical claims.
Marketplace note (Japan): Japanese required for compliant listings; cosmetics need Japan cosmetic notification, toys need the ST Mark / Toy Safety Standard.
Brand + Animal + Product + Key Benefit + Size/Count. Example: PetLab Joint Care Chews for Dogs 90ct - Glucosamine for Hip & Mobility Support.
'Supports mobility' is fine; 'treats arthritis' is a drug claim.
Buyers filter by count and weight; include them.
Yes as a descriptive benefit; avoid 'cures', 'treats', 'heals'.
Yes — 'for dogs' / 'for cats' dramatically improves matching.
Up to 200 characters; brand-first, readable.