Historical clue formulations

• Bone that squeaks, maybe — 2026-04-01
• Rubber bone, e.g. — 2025-01-07
• One might be squeaky or shaped like a bone — 2024-10-28
• Slobbery tennis ball, e.g. — 2023-11-07
• Something to chew on — 2018-10-07
• Rubber hamburger, e.g. — 2008-09-17