How quick does aspirin take to work?

Its better not to give your animals medicine just incase if you give them the wrong dosage they could have a heart-attack and in some cases they die, but it usually varies from the size of the dog and how much you give them. If its around the size of a German Sheperd than 5-10 minutes if you gave them half an aspirin, one the size of a spaniel or a beagel would be 4-8 mins and the size of a Yorkshire or a chihuahua would be around 3-6 mins.