Selarid Topical Solution for Dogs (20.1–40 lbs) – Red Box

Selarid Topical Solution for Dogs (20.1–40 lbs) – Red Box

Monthly Flea, Heartworm & Parasite Control by HardyPaw

Selarid Topical Solution for Dogs (20.1–40 lbs) is a prescription-strength, monthly spot-on treatment specially formulated to protect medium-sized dogs against a wide spectrum of internal and external parasites. Using selamectin—a potent antiparasitic compound—Selarid targets and controls fleas, heartworms, ear mites, sarcoptic mange, and ticks, ensuring complete parasitic protection in a single, easy-to-apply dose.

This veterinarian-recommended solution offers the same trusted active ingredient found in Revolution (selamectin), but at a more affordable price. Manufactured under stringent quality standards, Selarid helps prevent infestations while improving the overall quality of life for your pet.

Also Available in Other Weight Ranges

Selarid is formulated for pets of all sizes. Make sure you select the right dosage based on your pet's weight for safe and effective parasite protection.

• Shop Selarid for Puppies & Kittens - Mauve Box ( for Puppies & Kittens)
• Shop Selarid for Dogs 5.1–10 lbs - Purple Box  (for Small Dogs)
• Shop Selarid for Dogs 10.1–20 lbs - Brown Box  (for Small to Medium Dogs)
• Shop Selarid for Dogs 20.1–40 lbs - Red Box  (for Medium Dogs) --> you are viewing this product
• Shop Selarid for Dogs 40.1–85 lbs - Teal Box  (for Large Dogs)

🐶 Select the product that matches your pet’s current weight to ensure proper dosing and full-spectrum protection.

What Are the Key Benefits of Selarid Topical Solution for Medium Dogs?

Selarid goes beyond basic flea treatment by delivering broad-spectrum parasitic control in a monthly topical application:

• Kills adult fleas and prevents flea eggs from hatching (breaking the flea life cycle)

• Prevents heartworm disease caused by Dirofilaria immitis with regular monthly use

• Treats and controls ear mite infestations (Otodectes cynotis)

• Manages sarcoptic mange caused by Sarcoptes scabiei

• Controls American dog tick infestations

• Water-resistant and fast-absorbing formula

• Easy-to-use, single-dose applicators in a 6-month supply pack

• Comparable to Revolution for Dogs at a better value

How Does Selarid for Dogs Work?

The primary active ingredient, selamectin, belongs to the macrocyclic lactone class of parasiticides. It targets parasite neural and muscular systems, causing paralysis and death of the parasites. Applied topically, selamectin is absorbed through the skin and redistributes systemically to protect both internally and externally against:

How to Apply Selarid Topical for Medium Dogs?

Follow these easy steps for safe and effective application:

1. Remove one applicator from the blister pack.

2. Part your dog’s hair at the base of the neck between the shoulder blades.

3. Place the tip of the applicator directly against the skin.

4. Squeeze firmly to empty the contents in one spot.

5. Avoid bathing your pet for at least 2 hours post-application.

What Ingredients Are in Selarid for Dogs?

• Selamectin 60 mg/mL – a systemic antiparasitic and ectoparasiticide

Dosage and Administration for Selarid for Dogs (20.1–40 lbs)

Always consult your veterinarian for exact dosage instructions depending on your pet's condition.

• Recommended Dose: One applicator (1.0 mL) applied topically once per month

• Safe for dogs 6 weeks of age and older

• For dogs weighing 20.1 to 40 lbs only

How to Apply Selarid Topical Solution Correctly? [Step-by-Step Guide for Pet Owners]

Before using Selarid Topical Solution for the first time, a veterinarian or veterinary technician should demonstrate or explain the proper application technique. Proper application is crucial for ensuring maximum efficacy and minimizing the risk of improper dosage or skin irritation.

Follow the steps below carefully when applying Selarid to dogs weighing 20.1–40 lbs:

Preparation:

• Step 1: Remove the applicator from its foil pouch.

   

  • Use scissors or fold diagonally at the notch to expose the nick, then tear back.

   

• Step 2: Hold the applicator upright and gently tap the narrow end to ensure all liquid stays in the main body.

• Step 3: Twist or snap off the tip of the applicator.

Application:

• Step 4: Part your dog’s hair at the base of the neck between the shoulder blades until the skin is clearly visible.

• Step 5: Place the tip of the applicator directly onto the skin and squeeze firmly 3–4 times in one spot until the applicator is completely empty.

  • Important: Keep the applicator compressed during the final squeeze to avoid any backflow of liquid.

Application Tips & Warnings:

• While squeezing, do not touch the solution with your fingers.

• Drag the applicator away while still compressed and then lift it up to remove.

• Do not massage Selarid into the skin.

• Do not apply Selarid to wet haircoats or broken/irritated skin—the solution contains alcohol and may cause irritation.

Temporary Reactions at Application Site:

Some pets may experience:

• Clumping or stiff hair

• Mild discoloration

• Powdery residue

These are normal and temporary cosmetic effects that do not impact the safety or effectiveness of Selarid.

When Should I Start Selarid for Dogs? [Seasonal Use & Timing Tips for Flea & Heartworm Prevention]

Choosing the right time to start Selarid is essential for keeping your dog fully protected from fleas, heartworms, and other parasites. While some pests are seasonal, others—like heartworms—can be active year-round, depending on your climate.

Here’s what veterinarians recommend for effective prevention:

Start Before Flea Season Begins

• Begin administering Selarid in early spring, ideally before flea activity peaks (March–April in most regions).

• Flea infestations start before you see adult fleas, so early protection stops the life cycle before it begins.

Use Year-Round for Heartworm Protection

• Heartworms are transmitted by mosquitoes, which can be active year-round in warmer climates.

• Skipping doses increases the risk of infection, which can be fatal and costly to treat.

• Monthly use ensures continuous prevention of heartworm disease caused by Dirofilaria immitis.

Stick to a Monthly Schedule

• Apply Selarid once every 30 days, ideally on the same day each month.

• Set calendar reminders or sign up for auto-refill to avoid missed applications.

Missed a Dose? Don’t Panic

• If you forget a dose, apply it as soon as possible.

• Resume regular monthly dosing afterward.

• Do not double up on doses—just get back on track to maintain protection.

🐾 Consistency is key. Regular use of Selarid provides comprehensive parasite control and keeps your dog safe, comfortable, and itch-free.

Are There Any Side Effects or Warnings for Selarid?

While generally well-tolerated, some dogs may experience:

• Temporary hair loss or skin irritation at the application site

• Digestive upset such as vomiting or diarrhea

• Lethargy or changes in behavior (rare)

Warnings:

• For topical use on dogs only. Do not use on cats or other animals.

• Do not use on puppies under 6 weeks old.

• Keep out of reach of children and animals.

• Use with caution in dogs with known hypersensitivity to selamectin.

Shipping & Returns 

Shipping Policy: HardyPaw offer all types of shipping options (Ground, Express, Priority, International) depending on the urgency of the product requirements. To know about our shipping policy in detail, click here.

Refund policy: If you face any issue with our product and want to return it, read our refund policy carefully.

Selarid for Dogs FAQs

What is Selarid used for in dogs?

Selarid is a monthly topical solution used to prevent heartworms, kill fleas, control ear mites, manage sarcoptic mange, and control American dog ticks in dogs.

Is Selarid the same as Revolution?

Yes, Selarid contains the same active ingredient (selamectin) as Revolution and offers equivalent parasitic protection at a more affordable price point.

Can I bathe my dog after applying Selarid?

Yes, but it's best to wait at least 2 hours after application to ensure full absorption through the skin.

Is a prescription required for Selarid?

Yes, Selarid is a prescription medication. You will need a valid prescription from a licensed veterinarian to purchase.

Can Selarid be used with other flea or heartworm medications?

Veterinarians recommend avoiding multiple parasite treatments unless prescribed. Combining Selarid with other flea or heartworm meds may cause overdosing or interactions. Always consult your vet before combining treatments.

Is Selarid waterproof after application?

Selarid becomes water-resistant approximately 2 hours after application. Bathing or swimming before that time may reduce absorption and effectiveness, so it's best to wait before exposing your dog to water.

How long does Selarid take to start working?

Selarid starts killing adult fleas within 36 hours and begins preventing heartworm disease immediately with monthly use. For mites and mange, visible improvement typically occurs within a few days of application.

Can Selarid be used for puppies under 6 weeks old?

Selarid is not approved for use in puppies younger than 6 weeks of age. The active ingredient selamectin may be too strong for developing systems, so age-appropriate alternatives should be discussed with your veterinarian.

Does Selarid protect against intestinal worms?

Selarid does not treat common intestinal worms like hookworms or roundworms. Its spectrum targets fleas, heartworms, mites, mange, and ticks. For complete deworming, a separate broad-spectrum anthelmintic is needed.

🔗 Authoritative Medical Resources 

1. Selamectin - Veterinary Partner (VIN)

2. FDA Selamectin Approval Information

3. Heartworm Society - Heartworm Basics

4. CDC - Parasites - Fleas