and some of the items can be purchased from your vet, even if they aren't needed for this particular visit. If they are unwilling to sell them to you, tell them you will be looking for a new vet who is more reasonable and cooperative.
You need some ophthalmic ointment, without any steroids, such as Gentocin, Erythromycin or even BNP. I prefer ointment but you can use drops as well. This is for minor abrasion, irritation in the eye. Obviously a serious ulcer where the dog is holding eye closed or squinting, or you know there has been some assault to the eye, a vet ASAP is in order.
Malaseb wipes (plegets) are for cleansing wounds or skin that is seriously irritated. They are both antibacterial and antifungal and some other medication may be needed in addition but these are excellent for irritated deep tail folds, deep nose wrinkles, sore tear tracks on face.
Flagyl (metronidazole) for diarrhea. If the medication doesn't solve the problem in 48hrs, vet visit is needed to check for internal parasites or other causal factors.
A good ear wash (nonRx) and I prefer Nolvasan products, but other good ones exist...and these are used not only to cleanse ears but to clean hot spots and other minor skin irritations.
Benedryl tablets (25mg) (nonRx) should be another staple in your cupboard for allergy symptoms in Springtime, insect bites/stings, etc. Of course, watch for anaphylactic reactions where breathing is restricted...that is an EMERGENCY visit.
There are a whole lot of other things but these "medications" readily come to mind. Hopefully your vet will take 2-3 minutes and talk with you about this. -E.