Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to help an overweight rabbit lose weight [title] Understand the risks your rabbit can face if it is overweight. [step] Fat rabbits are often lethargic, and are susceptible to heart, liver, and kidney disease. They may suffer from chronic diarrhea, heat stress in hot weather, splayed legs, and arthritis in later years.

Ending1: Your rabbit can become dehydrated, if it is overweight. [substeps] Conditions that can cause a small rabbit to have problems with dehydration include mammary tumors or meningitis, pancreatitis, or weakened immune systems. Ending2: Obesity can also cause breeding and birthing difficulties. [title] Make sure your rabbit's weight is really indicative of a problem. Ending3: This usually warrants veterinarian attention, as you should see your veterinarian as soon as possible. [title] Keep the rabbit in a warm, dark area. Ending4: They may also develop osteoporosis and joint conditions that might affect your rabbit's ability to sit and move. Rabbits in this stage of development should see the vet every two to three days.

Answer format: ending1/ending2/ending3/ending4