Fleas and Ticks in Pets: Prevention and Treatment

If you live in Ensenada and have a pet, fleas and ticks are a real year-round problem. Baja California's mild coastal climate allows these parasites to reproduce without the winter pause that exists in other zones. Beyond the discomfort of bites and scratching, fleas can cause allergic dermatitis, anemia in small puppies, and transmit tapeworms. Ticks are vectors of serious diseases like rickettsiosis and ehrlichiosis.

This guide explains how to detect an infestation, which preventive products work and which are useless or dangerous, and why monthly prevention costs less than treating a single severe infestation.

How to detect fleas on your pet

Adult fleas are 1-3 mm and move fast through fur. Watch for these signs:

• Excessive scratching: especially at tail base, belly, armpits, and ears.
• Skin nibbling: your pet bites itself as if catching something.
• Flea dirt: small black dots like pepper in fur, especially near tail. If placed on wet paper they turn reddish-brown (digested blood).
• Scabs or pimples: in intense scratching zones.
• Thinning fur or bald patches: from chronic scratching.

Inspection tip: use a flea comb (very close-set bristles) on the back and tail base. If fleas or flea dirt come out, there is infestation.

How to detect ticks

Ticks are larger (3-10 mm when engorged) and stay fixed to the skin sucking blood. Favorite areas:

• Ears (inner part and edge).
• Neck and between front legs.
• Between toes.
• Around eyes.
• Genital area.

Inspect your dog after each outdoor outing, park, or beach by running fingers throughout the body. A tick feels like a hard bump stuck to the skin.

Preventive products that work

Several effective options exist. Your veterinarian will help choose by species, weight, age, and lifestyle:

Oral antiparasitics (monthly tablets)

Products like NexGard, Bravecto, or Simparica kill fleas and ticks that bite your pet. Bravecto lasts 3 months per dose. Very effective, easy to administer, and not "washed off" by bathing. Recommended especially for dogs.

Spot-on pipettes (monthly)

Frontline Plus, Advantage, Revolution. Applied to the nape on the skin (not fur). Repel and kill parasites for 1 month. Work well if your pet does not bathe constantly.

Antiparasitic collars

Seresto is the most clinically backed: protects up to 8 months against fleas and ticks. Other unknown brand collars may be ineffective or toxic.

Shampoos and powders

Useful to kill fleas present during bath, but do NOT prevent reinfestation. Used only as occasional complement, not as prevention.

Products that do NOT work (or are dangerous)

• Garlic, vinegar, coconut oil: myths without evidence. Garlic is also toxic to dogs and cats.
• Generic pharmacy plastic strip collars: ineffective or very short duration.
• Essential oils (citronella, eucalyptus, lavender): toxic especially to cats. Can cause liver and respiratory problems.
• Dog products applied to cats: many contain permethrin, highly toxic to cats and can cause seizures and death.

Why prevention is cheaper than treatment

A monthly antiparasitic treatment costs 200 to 400 MXN per month. Treating a severe infestation involves:

• Animal treatment (shampoo, antiparasitic, antibiotic if dermatitis).
• Environmental treatment (insecticides, washing beds, clothes, sofas).
• Multiple veterinary consultations.
• Treatment of transmitted diseases (rickettsiosis, ehrlichiosis, tapeworms).

Total cost of managing an infestation easily exceeds 3,000-5,000 MXN, not counting pet suffering and family health risk (some tick-borne diseases are zoonotic).

Diseases transmitted by fleas and ticks

• Flea allergic dermatitis (FAD): a single bite can trigger severe reaction in sensitive pets.
• Anemia: severe infestation in small puppies can cause fatal blood loss.
• Tapeworms (Dipylidium): fleas transmit tapeworm eggs when the pet swallows them while grooming.
• Rickettsiosis: see our dedicated article. Tick-borne, zoonotic.
• Canine ehrlichiosis: tick-borne bacteria. Affects bone marrow, can be chronic and fatal.
• Babesia: tick-borne protozoan. Destroys red blood cells.

Treatment if infestation is already present

If you already discovered fleas or ticks, follow these steps:

1. Veterinary consultation: your vet will assess severity, rule out transmitted diseases, and prescribe appropriate treatment.
2. Pet treatment: fast-acting oral antiparasitic or pipette that kills present fleas and ticks.
3. Environmental treatment: deep vacuum the house (eggs are in floors, carpets, sofas), wash bedding and blankets with hot water, consider environmental insecticide if severe.
4. Continuous prevention: start the monthly schedule from day 1 to prevent recurrence.

Important with ticks: do not pull them off by hand. Use tick tweezers or have your vet remove them properly. Pulling incorrectly can leave the head embedded and cause infection or more efficient disease transmission.

When to go to the vet

• If fleas or ticks persist after applying product.
• If your pet has fever, lethargy, or pale gums after a bite.
• If you find a poorly removed tick (head embedded).
• If you have multiple pets at home (group infestation requires coordinated protocol).
• If young children are at home (higher zoonosis risk).

Antiparasitic prevention at Medical Pets

At Medical Pets Ensenada we carry the main external antiparasitic brands (Bravecto, NexGard, Seresto, Frontline) and guide you on which best fits your pet by age, weight, and lifestyle. We can also do complete examination to rule out transmitted diseases if your pet had a recent infestation.

Schedule an antiparasitic consultation or contact us by WhatsApp if you have questions about which product to use.

Frequently asked questions