Pet care products — what each one actually does

Flea and tick preventatives

Modern flea and tick preventatives fall into a few categories by active ingredient class. The most commonly prescribed in small-animal practice are the isoxazolines (fluralaner, afoxolaner, sarolaner, lotilaner), which protect against fleas and several tick species for one to three months per dose.

A few practical notes:

• Over-the-counter flea collars and "natural" sprays are generally less reliable than prescription products, especially in areas with high tick pressure.
• If you have a dog and a cat in the same household, do not apply dog-only flea products to a cat. Some ingredients (notably permethrin at treatment doses) are toxic to cats.
• For pets that swim or get bathed frequently, oral products tend to hold their effectiveness better than topical spot-ons.

Heartworm prevention

Heartworm disease is transmitted by mosquitoes and is potentially fatal if untreated. It is more common in dogs than in cats, but cats can be infected too. Prevention is dramatically easier, cheaper, and safer than treatment.

Standard preventatives are monthly chewables or topicals (ivermectin, milbemycin, moxidectin) or an injectable (moxidectin sustained-release, given every six or twelve months by your vet). All are prescription products. Heartworm testing is required before starting a preventative in dogs over six months old, and is repeated annually.

The preventatives work against the larval stage of the worm. If a dog is infected before starting prevention, the preventatives do not kill adult worms — that requires a different, more involved treatment protocol.

Dental products

The most effective home dental care is brushing with a pet-safe toothpaste (do not use human toothpaste — it contains fluoride and foaming agents that upset a pet's stomach). Aim for daily, but a few times a week still helps.

If brushing isn't realistic for your pet, the next tier of effectiveness is:

1. VOHC-approved dental chews — the Veterinary Oral Health Council seal indicates the product has been shown to reduce tartar or plaque.
2. Prescription dental diets — kibble formulated with a fiber matrix that mechanically scrubs the tooth as the pet chews.
3. Water additives and dental wipes — modest benefit, useful for pets that tolerate nothing else.

Microchips

A microchip is a sterile, rice-grain-sized implant injected under the skin between the shoulder blades. It carries no battery and no personal data — just an ID number that resolves to a registry record with your contact info. Any vet clinic or shelter can scan for it.

Standard registration fees apply. After you register, keep your contact information current when you move or change phone numbers. The single most common reason a microchip fails to reunite a lost pet with its owner is outdated registry data.

Nutrition and prescription diets

For most healthy adult dogs and cats, a commercial diet labeled "complete and balanced" by AAFCO is appropriate. The brand matters less than the formulation and your pet doing well on it. Watch for: stable weight, good coat quality, normal stools, and adequate energy. If any of those drift, a diet change is reasonable to discuss with your vet.

Prescription diets are formulated for specific medical conditions — kidney disease, urinary issues, food allergies, gastrointestinal disease, weight loss. They are sold through vet clinics because the formulation and the condition it targets need to be matched by a vet who has examined the pet. Over-the-counter "grain-free," "limited ingredient," or "raw" diets are unrelated to these and have their own considerations.