@悲观的马迷
Horses and equines in general are perfectly capable of digesting small amounts of meat. Especially processed meat like a burger since it’s easier to chew than a steak.
Not for sweet summer-children: Google “horse eats chicken” if you want video evidence.
Horses can, and sometimes do, eat meat. Horses have been seen eating carrion or human food trash containing meat. It’s strange but true. It’s not good for their health, but that’s never stopped anyone from eating something bad for them. <looking at mostly-empty bottle of whiskey>
However, meat substitutes are getting better. The “Impossible Burger”, which is based upon soy, is quite good. Burger King offers their hamburgers either as beef or with the “Impossible Burger” meat substitute and to be honest, its very close in flavor and texture. When I go to Burger King, that is what I will order. I am not a vegetarian, but I know the environmental impact of beef is extremely high when compared to the same amount of other meats or plants, so this is a way for me to do a very small bit to help out.