Dogs only have about 1/6th as many taste buds as humans, but they can still taste salty, sweet, and bitter things in their food.
https://www.akc.org/expert-advice/lifestyle/can-dogs-taste/
ref - https://www.reddit.com/r/todayilearned/comments/dyvkrz/til_dogs_only_have_about_16th_as_many_taste_buds/
origin - https://www.pipiscrew.com/?p=15845 can-dogs-taste