Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to identify canine flea problems [title] Look for behavioral signs of a flea infection. [step] Is your dog scratching itself more than usual? Is it gnawing at its coat? These are signs that your dog might have fleas. [substeps] Flea bites can cause itchiness on the dog's skin.

Ending1: Flea bites can also appear as other symptoms of fleas, such as a rash. You may see different white patterns appear on your dog's skin, such as irregularities on the legs. Ending2: The bites can make small red bumps on the skin and continue to itch for some time. Some animals can actually be allergic to these bites, making the itching and redness more intense and widespread. Ending3: There may be substantial accumulating beard hairs, brown hair, or quills. Even fleas that come from dog's fur may cause itching that leads to cushing's disease. Ending4: These sores are believed to be caused by fleas. White pus-filled sores, discolored gums, itchy or red spots may appear after scratching.

Answer format: ending1/ending2/ending3/ending4