I would like a native or a moderator to confirm what you say. Couldn't it be that since dogs are usually pets and that means you love/respect them you use "isst"? Or "isst" is used because "frisst" is now obsolete?
I don't understand why i lost a heart for selecting 'The hounds are eating bread'. The other option is horse, or 'the hound are eating bread' which obviously doesn't make sense. What's going on here? Am i missing something?