HOUSTON (AP) — Pandu, the 286-pound Malayan tiger stretched out on the gurney in the Houston Zoo’s hospital, had bone chips — big ones — in his right elbow.

Ivy the leopard, being prepped in another room, also needed medical treatment for her limp. The zoo’s 68-pound black cat, which had arthroscopic surgery in 2009, was showing signs of pain again in her elbows.