This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to treat flea bites on dogs
Look for small red dots, flea dirt, and flea eggs on your dog's skin.
One of the most conspicuous signs of fleas are what they leave on your dog. Take a close look at your dog's skin to see if they have any small, red, raised bite marks.

(1). Look for : Flea dirt or eggs ingestion poison Watch your dog carefully for flea activity. If your dog appears to be running more on the bite site and has trouble walking, don't assume it has fleas.;
(2). You may also see tiny red blisters on your dog's skin, or their paws itching. They may also smell too bad to be flea scratch treated and they might sweat or appear smelly.;
(3). Additionally, fleas often leave behind " flea dirt, " which will look like small, dark grains of sand, as well as small white eggs that resemble tiny grains of rice. If your dog has an allergic reaction to the bite, the red area may be larger.;
(4). If your dog does have a flea bite, it's a good sign that they may be a flea. Flea bites on a dog can be caused by all sorts of things including allergens, chemicals, or insects.;
The answer is:
(3).