Recently switched my dogs to insects after going through about 10 different diets. They're greyhounds, which have notoriously delicate constitutions. What worked really well is a kibble made from mealworms. Not wishing to be disgusting, but their shits sent from pancake batter to "completely normal" within a few days. Apart from a few occasions (where one of them foraged raspberries from our garden) they've been great. Happy, energetic dogs with shiny coats. As a vegetarian (for ethical reasons, mainly climate change) I'd consider adding them to my diet if I could get them at a reasonable price. Technically they should be cheap, but they're ridiculously expensive if you can even get them.