Just come home from shopping and noticed a bag of mints that has clearly been eaten by my dog, he seems fine just wondering if he should be ok.

Do they contain the artificial sweetener Xylitol? ~If so, urgently contact your vet as it is very dangerous.

Otherwise I would still call the vet with the list of ingredients and ask for advice.

Least he won't have doggy breath anymore

Yes as above ring the vet with list of ingredients, may be fine but some artificial sweeteners are very bad.

they were pandrops

Have you rung the vet ?

Pan drops are usually just glucose, sugar and peppermint oil but best to be sure - check the ingredients on the bag.