Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to tell if your dog has fleas [title] Watch your dog for excessive scratching or chewing. [step] Flea bites are extremely itchy, so the first sign of a flea infestation is usually seeing your dog scratching or chewing itself more than usual. [substeps] Other behavioral signs of fleas might include head shaking, hair loss, scabs, or hot spots.

Ending1: [title] Examine your dog's skin for tiny, red, raised bumps. [step] Are usually smaller than other insect bites. Ending2: Fleas can also cause skin irritations, so be on the lookout for these. [title] Feed your dog the right amount of treats. Ending3: With flea bites, your dog will scratch excessively. Your dog's fur may also get wet, so help your dog out if it's currently having fleas. Ending4: [title] Watch your dog for double or triple flea infestations. [step] These are relatively rare and only appear once your dog starts having flea hairballs.

Answer format: ending1/ending2/ending3/ending4