[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. 
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.