Should you cook your dogs vegetables?
Cellulase is a digestive enzyme, it breaks down fibre from plants and grains, dogs, humans, and any mammal do not naturally have this enzyme, so our bodies can't break down foods HIGH in cellulose like hay but fruit & veggies don't actually have super high amounts of cellulose as a broad generalisation so aren't really too much of an issue for dogs.
BUT because dogs aren't chewers like humans are, they often don't break down some plants well enough so plants with tough skins such as blueberries and corn will simply pass through the digestive system the same way they went in, this is why we as pet parents will go to the extra effort of pre-chewing plant matter like this for dog and by this, I don't mean we personally chew it hehehe, we blend it/grate it/finely chop it, etc.
Fermenting and cooking veggies are other ways of breaking down the cell wall BUT with the likes of corn for example, simply cooking it isn't enough, you'll need to break down that skin with blending for example.
So, whilst lightly cooking and then blending etc. would be the absolute gold standard for vegetables for absorption, it isn't a must for most veggies where you can simply get away with manually breaking down the cell wall vs cooking.
We also know that wild dogs/wolves eat plant matter in its natural form, this is very well documented by experts in the field.
If dogs could not break down plant matter then herbs wouldn't work on dogs...and we know they do 🙂 In addition to this, let's also add to that plants that are toxic to dogs, if dogs couldn't break them down well enough then why are they affected by them in a negative way? Food for thought huh? 🙂