Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to look after your sick guinea pig [title] Let the vet examine your guinea pig as soon as they become ill. [step] Once guinea pigs get sick, they can go downhill fast. If you notice any signs of illness in your guinea pig, bring them to the vet right away.

Ending1: You should do all you can to ensure that your guinea pig stays healthy and does not require more treatment than it already has. [title] Give your guinea pig vaccinations. Ending2: You should also place them into a warm sleeping bag or a carrier until help arrives. [substeps] Many questions you may want to ask your vet include if you get sick frequently or how often. Ending3: [title] Discuss your guinea pig's symptoms with the vet. [step] Guinea pigs often contract an illness due to improper care, an improper diet, or interaction with another guinea pig who has an infectious disease. Ending4: Let the vet run a series of tests to look for infection. [substeps] If the vet sees any obvious signs of infection, they can prescribe a course of antibiotics to lower your guinea pig's immune system.

Answer format: ending1/ending2/ending3/ending4