A heartworm preventive only works on a strict monthly rhythm, and that rhythm is easy to lose. PetHealthLog lets you log each dose the moment you give it and shows the exact next-due date, so a month never slips by unnoticed - free, no account, and it works offline.
Start tracking - it's freeBuild a printable prep checklist — what to bring, what to write down, questions to ask.
Heartworm prevention sounds simple: one dose a month. In practice, "the first of the month" becomes the third, then a busy week swallows it, and before long you genuinely cannot remember whether this month's dose was given. With a monthly preventive, that uncertainty is the whole problem - the protection depends on the doses landing close together, month after month.
A phone alarm helps until you snooze it and forget. What actually keeps the rhythm is a record: a clear last-given date, a clear next-due date, and an overdue dose that does not vanish if you skip it.
That is what a dog heartworm prevention monthly reminder is for. PetHealthLog keeps it simple: it is free, it asks for no account, and it works offline, so the schedule is there whether you dose at home or away.
A monthly preventive only stays consistent if the record is fast to update and easy to check. Here is how PetHealthLog handles both.
Add the heartworm preventive your vet has prescribed and set it as monthly. It then sits on your dog's schedule, so you are not re-deciding the plan each month.
Mark a dose given and the app shows when next month's dose is due. No counting forward in your head, no wondering how many weeks it has been.
An overdue dose stays visible rather than disappearing, so a skipped month is something you notice now and can raise with your vet - not something you find out about later.
A simple streak rewards staying on schedule, which is exactly what a year-round monthly preventive needs. It nudges the routine without nagging.
Export a clean PDF of your dog's records, including the preventive doses you have logged and recent weight, to take to the vet so the conversation starts from an accurate history instead of a guess.
Heartworm prevention is not one-size-fits-all. Whether a dog needs it year-round, which product is right, and when testing is needed all depend on where you live and your dog's situation. Those are veterinary decisions, and a missed-dose situation in particular can need specific advice.
PetHealthLog does not choose the product and it does not decide your dog's prevention plan. It gives you a reliable place to record the preventive your veterinarian has prescribed and to keep it on a steady monthly rhythm. The product, the schedule and any testing should always be decided with your vet.
You often give a monthly dose somewhere ordinary - the kitchen, the car before a trip, a relative's house. An app that needs a login and a live connection can stall in exactly those moments, which is the opposite of what a "do not forget this" tool should do.
PetHealthLog stores everything locally on your device. There is no account to create, nothing is uploaded to a server, and there is no tracking. It opens instantly, shows the next due date whether or not you are online, and keeps the data yours. Because it lives only on your device, you can export a backup any time and restore it on another phone.
Free, offline, and ready the moment you open it.
Start with PetHealthLogKeep monthly flea and tick treatments on time and see the next due date, alongside heartworm prevention.
Log each wormer dose with its date and see when the next worming is due, on the same offline timeline.
Schedule each medication once and catch up on missed doses, with a streak that keeps a daily routine on track.
Log DHPP, rabies and other shots, then see when the next booster is due, on the same offline record.
Heartworm preventatives are prescription-only from your vet. These search links show related supplies on Amazon; the preventative itself must come from your vet.
Dog heartworm test kit → Mosquito repellent for dogs → Pill pockets for pets →#ad - affiliate links: as an Amazon Associate, PetHealthLog may earn from qualifying purchases at no extra cost to you. Informational only, not veterinary advice.
Looking for product picks? Browse all PetHealthLog buyer guides → — vet-informed picks with #ad affiliate links. Always confirm the right product with your own vet.
A tracker is for patterns over time — it is not for emergencies. Contact a veterinarian or an emergency clinic right away if your pet has difficulty breathing, collapses or cannot stand, has a seizure that does not stop or seizures that repeat, is straining to urinate without producing urine, has severe bleeding, or may have swallowed something toxic (see ASPCA Animal Poison Control).