Bees are generally non-aggressive and will only sting when threatened. However, dogs may accidentally disturb a bee while sniffing or playing, resulting in a sting. Most bee stings will cause only localized pain, swelling, and redness, but some dogs may experience severe allergic reactions, including anaphylaxis.
Wasps, unlike bees, can sting multiple times, making them potentially more dangerous. Although wasps are also generally non-aggressive, they may attack if they perceive a threat to their nests. Wasp stings can cause similar symptoms as bee stings, but the risk of a severe reaction is higher due to the potential for multiple stings.
Hornets are a subset of the wasp family and are known for their aggressive behavior when their nests are threatened. Hornet stings are more painful than those of bees and wasps, and they also carry a higher risk of severe allergic reactions.