Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to detect skin cancer in dogs [title] Screen your dog routinely for signs of skin cancer. [step] As with all illnesses, detecting the symptoms early gives the best chance for a successful outcome. Make weekly full body examinations a routine.

Ending1: After two-weeks of examination, you should be able to detect microorganisms. Naturally occurring bacteria, like mycoplasma, are the most likely causes of skin cancer in dogs. Ending2: Take your dog to the vet for an annual check up. [substeps] On its first visit, rub its belly once or twice per week. Ending3: Run your hands over every inch of your dog to feel for any lumps or bumps. [substeps] Your dog will probably love this attention and may think it's a massage. Ending4: Many pregnant women come across a dog exhibiting no apparent symptoms after 24 hours, after which you can inspect the dog's entire body. [substeps] Bring your dog in for a look.

Answer format: ending1/ending2/ending3/ending4