One of the common bits of hokum you will sometimes hear, is that splitting a heartworm pill for a 50-pound dog, in order to treat two 25-pound dogs, is somehow bad, or even "dangerous".
How will you know which half of the pill has the medication?
If anyone who works in a vet's office tells you this nonsense, find a new vet.
Pills are not made with magic elves putting little drops of active ingredients on blank tablets with an eye dropper.
Pills, like dog food, spaghetti, and a thousand other things, are made in massive machines holding thousands of pounds of drug goods and chemicals that are mixed into a uniform slurry. That slurry is then extruded through a nozzle, or stamped in a mold, and then baked or dried to final shape before being tumbled with a preservative or coating.
The video below shows the process. It's important to note that there is no medication given in tablet, capsule, or caplet form whose dosage is so critical that a slightly sub-strength or extra-strength pill or from an uneven mix will have any negative health impact.
Here's a hint: Every drug store in America sells pill-splitters so that senior citizens and others can save money doing exactly what some halt-wit on the Internet is telling you is dangerous and wrong for your dog.
If you want to know how they make capsules and gel caps, use the Google or the search engine on the YouTube web site. It's all the same.