Your dog probably has fleas if it likes to play in shady outdoor spaces with sand, leaves, or other debris, which is where fleas live. Several apparent symptoms will show whether your dog has fleas. You should see if you could detect any of these tiny bugs throughout your dog's coat whenever you observe that their itching is worse than usual, especially near the flank or just above the tail.
You can sometimes see "flea dust," which appears as minuscule black specks or black insects that may jump off if you split your pet's fur. Having multiple pets or having your dog hanging around other animals increases their likelihood of developing fleas or ticks. If another dog owner expresses their dog has fleas, and your dog usually interacts with theirs, that is a sign to check for parasites and administer treatment accordingly.