A quick word about "looking healthy". Huge is not good. Huge usually means a fat rabbit. Fat rabbits usually die an early death from Hepatic Lipidosis....aka Fatty Liver Disease. The liver is extremely stressed in obese rabbits. Metabolic Bone Disease is also something to consider. Many times the animals will "look" healthy but are in fact, very sick. MBD is nearly always a nutritional issue caused by improper food. It is a very common issue in baby wildlife when people (illegally but well intentioned) that are untrained try to "care" for these animals. Squirrels, opossums and birds are very prone to MBD. While they may appear healthy, they may have very brittle bones....and since a rabbit's skeletal system makes up only 7% of it's body mass...that can easily lead to fractures. Fur loss, weight loss, deformities, CNS problems including seizures...even shifting teeth due to the softer than normal jaw bone....and many other issues might be present. Something else I am seeing more often as we have more inside rabbits is a D3 deficiency. D3 comes from two places...either exposure to direct unfilteredsunlight or supplements in fortified foods. Many rabbits that are inside and/or are fed low quality food will develop this vitamin deficiency. Proper diet in a domestic rabbit is low protein (limited high qualitypellets) and high fiber (unlimited grass hay) along with limited greens.
Randy