These are planthopper nymphs (juveniles), and the type that produces this white, fluffy wax coating on their bodies are quite common on a variety of plants. They feed on plant sap, but do not cause significant damage and can be ignored. A blast of plain hose water will knock most of them off if you prefer, but others will probably reappear at some point in the future. No insecticide use is recommended, or even all that helpful for this situation.

Planthoppers will look a bit different as adults, often neon green or gray-brown in color, but are equally able to be ignored at that point. They are not harmful to people or pets in that they cannot bite or sting, and are not toxic as far as we're aware, but we don't know if a pet would get sick to its stomach if they managed to eat a bunch of them, so check with a vet. (Given that they run and jump away readily if disturbed, it's unlikely a dog would be able to catch more than one or two anyway, so the concern is quite low for harmful exposure from eating too many insects.)

Miri