You might run into aspartame as one of the main artificial sweeteners which isnot something you want your dog to consume but it isnot necessarily as dangerous for them as xylitol.
You may have noticed that 5 Gum contains aspartame.
Additionally erythritol stevia saccharin and sucralose are notable artificial sweeteners.
The question at this point may be why are artificial sweeteners used instead of sugar in the first place.
There are a number of reasons for this but the most important one is that they do not cause tooth decay.
Moreover they are almost calorie-free.
Additionally artificial sweeteners use less energy than real sugar to achieve the same results so factories can use them at a lower cost.