If you have more than one dog, like I do, when it comes time to give them all medicine, it can be a little overwhelming. (Smile) I give my dogs heartworm medicine every month, and the regular wormer about once a year. I've learned a few things to help make it not so overwhelming.
First, I keep a piece of paper in the drawer where I keep the meds. On that paper I have each dog's name with their weight wrote out next to it. (You don't have to reweigh them more than once a year unless you have a growing puppy or you notice by looking that your dog might have gained or lost weight.)
Next I bring out a couple of disposable foam plates and a marker. (I only do two dogs at a time instead of wasting a pile of plates.) I write the dog's name and weight on the edge of the plate with the marker. I put some can dog food on the plate, the amount depending on the size of the dog. You don't want to put too much because you don't want to take a chance on them maybe not cleaning their plate.
Now that I'm ready to measure the meds, I have the dog's name and weight right in front of me. That way I'm not likely to make a mistake, and I'm not going to mix the plates up and give Max at 67 pounds the plate I fixed for Clover at 53 pounds. I've worked hard to train my dogs that when a plate is put in front of one, that the food on that plate belongs to that dog, but them being dogs, you still have to watch closely until those two plates or clean. If you can't get your dogs to do that, then put the food and each dog in a room away from the others so there is no chance of someone not getting all of his meds, or even worse, of someone getting an overdoes.
When those two dogs are done, I pick up the plates, mark through the names and weight on them, write in the next two dogs' names and weights, and repeat until they have each had their meds.
The last thing I do is mark it on the calendar so I'll know for sure what date they were given the meds on.