Cassiel Pet Avermectin Spot-On Drops for Dogs & Cats – Flea & Tick Control and Prevents Reinfestation

Cassiel Pet Avermectin Spot-On Drops are a monthly topical treatment for dogs and cats. Applied directly to the skin, the Avermectin-based formula helps manage fleas, ticks, mites, and lice without the need for bathing or frequent spraying.

Dogs that spend time outdoors and cats in multi-pet homes are especially prone to external parasites through yards, parks, bedding, and contact with other animals. A consistent monthly application helps reduce this exposure and supports healthier skin and coat over time.

What Is Avermectin?

Avermectin B1 is the active ingredient in this formula. It belongs to a class of compounds used in veterinary parasite control for its effect on the nervous system of fleas, ticks, and mites. In a topical form, it spreads through the pet’s natural skin oils and comes into contact with parasites on the coat and skin surface.

Not all Avermectin products are the same. Concentration, carrier, and dosage instructions can vary widely. Cassiel Pet’s version is specifically formulated and dosed for dogs and cats by body weight, rather than being adapted from livestock or agricultural products.

Avermectin vs Ivermectin: What’s the Difference?

Ivermectin is part of the same broader family of compounds as Avermectin. In practice, products labeled “avermectin” or “ivermectin” can differ significantly in concentration, form, and intended use.

• Ivermectin products come in oral, injectable, and topical forms. Some are made for companion animals, while others are intended for livestock.
• Cassiel Pet Avermectin Spot-On is a topical formula developed and dosed specifically for dogs and cats by weight.
• Livestock products are usually much more concentrated. Using them on pets without proper guidance carries real dosing risk.

For dogs and cats, the most important factor is whether the product was actually formulated and labeled for companion animals—not just the compound name.

How It Works

Apply the drops between the shoulder blades or along the upper back, where the pet can’t easily lick. The formula spreads across the skin through natural oils and is designed for once-monthly use.

Because it isn’t rinsed off like a shampoo, regular monthly application is especially useful for dogs that go outside often or any pet living with other animals.

For Dogs

Dogs mainly pick up fleas and ticks outdoors—in parks, gardens, on trails, or through contact with other dogs. A monthly spot-on is often easier to maintain than daily oral chews or collars.

Common situations where owners start using it:

• Dogs that regularly play outside or in grass
• Pets that meet other dogs on walks
• Seasonal increases in flea and tick activity
• Multi-pet homes with both dogs and cats
• Dogs that scratch, bite, or groom more than usual

For Cats

Even indoor cats can get fleas. They can be brought in on people, other pets, clothing, or visitors. Because cats groom frequently, apply only the amount listed for their weight and place it where they can’t easily lick it off.

Situations where cat owners often use external parasite care:

• Indoor cats living with outdoor pets
• Multi-pet households
• Cats exposed to unfamiliar animals
• Seasonal flea activity in the area

Why Choose Spot-On Drops?

Spot-on drops work well for owners who want a simple monthly routine. Shampoo and spray are better as supplements when pets already need frequent bathing or have visible fleas in specific areas.

Multi-Pet Households

In homes with more than one dog or cat, treating only one animal is usually not enough. Pets share bedding, furniture, and outdoor spaces, so fleas can move between them. Give each pet its own correct dose based on weight—never split one tube across multiple animals.

Product Specifications

How to Apply

1. Make sure your pet’s coat and skin are clean and dry.
2. Part the fur until you can see the skin, between the shoulder blades or along the upper back.
3. Apply the full recommended amount directly onto the skin.
4. Let it spread on its own—do not rub it in.
5. Prevent licking until the area is dry (usually within a couple of hours).

Tips:

• Use the correct amount for your pet’s actual weight.
• In multi-pet homes, treat each animal separately.
• Avoid bathing for 24 hours after application.
• Do not apply to wet fur or broken skin.
• Wash your hands after use.

Dosage Guide

Dosage is based on body weight. Each pet needs its own measured application—never share one dose between animals.

Safety Information

• For external use only on cats and dogs 8 weeks of age or older.
• Use the correct amount based on actual body weight.
• Apply only to dry, healthy skin. Do not use on inflamed or damaged skin.
• Avoid contact with eyes, mouth, and open wounds.
• Keep out of reach of children and other pets. Consider a protective collar if needed.
• Wash hands after application. Avoid touching the site until dry.
• Do not use during lactation. Use with caution in early pregnancy, weak pets, or animals under 1 kg.
• Licking the site may cause temporary salivation due to the carrier.
• Allergic reactions are uncommon. Seek veterinary help if serious side effects appear.
• Residual product is toxic to fish and shrimp—do not contaminate water sources.
• Store in a cool, dry place away from direct light.

Important: Do not use this product together with acetaminophen (paracetamol). The combination may cause serious or fatal reactions.

MDR1-Sensitive Dogs

Some herding breeds (including Collies, Australian Shepherds, Shetland Sheepdogs, and related mixes) may carry an MDR1 gene variant that increases sensitivity to certain compounds in this class. If your dog is known or suspected to carry this gene, consult a veterinarian before use.

Frequently Asked Questions

What is Avermectin used for in dogs and cats?

It is the active ingredient in this topical formula, used as part of external parasite care for fleas, ticks, mites, and lice.

What’s the difference between Avermectin and Ivermectin?

They belong to the same family of compounds, but finished products can differ greatly in concentration, form, and intended species. What matters most is whether the product was specifically made and dosed for dogs and cats.

Can I use livestock Ivermectin on my pet?

No. Livestock formulas are much more concentrated and are not labeled for companion animals. Using them carries real dosing risk.

How often should I apply it?

Once a month, following the weight-based dosage guidelines.

Can indoor cats still get fleas?

Yes. Fleas can be carried indoors on people, other pets, clothing, or visitors.

Can multiple pets share one tube?

No. Each pet needs its own correct dose based on weight.

Does it work immediately?

Not always. Some flea activity may continue for a while after application. Follow the directions, treat every pet in the home, and clean bedding and shared areas.

Should I bathe my pet first?

The skin should be dry before application. Avoid bathing again for 24 hours afterward.

Can puppies and kittens use it?

This product is for cats and dogs 8 weeks and older. Do not use on younger animals.

Why is my dog still scratching?

Scratching can continue for other reasons, such as skin sensitivity or allergies. Some owners pair external parasite care with an internal option like Cassiel Pet Anti-Itch Tablets. If scratching is severe or doesn’t improve, see your vet.

Can fleas come back?

Yes. Ongoing exposure from the environment or other animals means fleas can return. A consistent monthly schedule helps prevent this.

Quality & Certification

Cassiel Pet Avermectin Spot-On Drops are produced at a facility registered with the U.S. Environmental Protection Agency under FIFRA Section 7. The product also holds veterinary product approval in China.

• FDA Establishment Identifier: 3041651447
• DUNS Number: 454545940
• EPA Establishment Number: 106193-CHN-1
• Veterinary Product Approval (China): 兽药字 180762069

An EPA establishment number identifies the registered production location. It does not mean the individual product is EPA-registered or endorsed.

View Cassiel Pet Certification Information

Complete the Routine

External parasite care is one part of overall pet wellness. Many owners also support digestion and daily health with:

• Cassiel Pet Natural Dog Parasite Support Chews
  Chicken-flavor chews that support digestive balance, skin health, and daily wellness.

Learn More

For product demos and pet care videos, visit the Cassiel Pet Official YouTube Channel.

Explore the Cassiel Pet Health Guide for more on everyday dog and cat care.