Short answer: Dogs pick up fleas from environments where fleas live: tall grass, leaf litter, carpets, other infested pets, wildlife yards (squirrels, raccoons, feral cats), and boarding/groomers. Once an adult flea jumps on, it stays and starts laying 40-50 eggs per day.
What you should actually do
- Adult fleas are 5% of the flea population – the other 95% (eggs, larvae, pupae) live in the environment.
- Common sources: yards with wildlife traffic, dog parks, boarding, groomers, other pets.
- Indoor dogs can absolutely get fleas – especially in apartments where neighbors’ cats/dogs are infested.
- Pupal stage can lie dormant 6+ months waiting for warmth/vibration – moving into a home where previous pets had fleas can trigger an outbreak.
- Year-round modern preventives (NexGard, Simparica, Bravecto, Credelio) prevent infestation in 99%+ of cases.
The flea life cycle makes prevention much easier than elimination. Once an infestation is established in a home, it can take 3+ months to fully clear because of the pupal stage. Single missed monthly doses can let an infestation re-establish.
Consider: every pet in the home on year-round prevention + environmental hygiene (vacuum weekly, wash bedding monthly, consider IGR sprays for outdoor areas).
Dig deeper
⚕️ Medical Disclaimer
The information on this page is intended for educational purposes only and does not replace a hands-on veterinary examination. Drug doses depend on your dog’s complete clinical picture, concurrent medications, and the exact product formulation. Always confirm dosing with your veterinarian before administering any medication, and contact a 24-hour veterinary emergency service or animal poison control immediately if you suspect a medication overdose or adverse reaction. Editorial standards: every drug dose published on PuppaDogs is cross-checked against multiple authoritative veterinary references and reviewed by PuppaDogs Veterinary Editorial Team before publication.
