1. How these treatments work
Modern spot-on and tablet products create a protective level of medication in your pet’s system that lasts the full month (or longer), with a built-in safety margin.
2. The built-in buffer
Manufacturers assume real-world life happens—holidays, postal delays, the occasional “oops, I forgot.” A few days' slip still leaves an effective barrier against parasites.
3. What if it’s more than a week?
Protection gradually tapers rather than switching off overnight. Simply give the dose as soon as you can and restart your usual monthly schedule from that new date.
