Inbreeding dogs should be illegal. If you breed dogs (or cats/other pets), you should be required to submit proof that the parents are genetically far enough apart.

However, sometimes it’s not the dog that’s the problem, it’s the food. Pet food has basically no regulations and no real way to independently verify the quality of ingredients, so companies will use the cheapest scraps possible that were otherwise headed for the dumpster, while charging similar to or even more than human food. And they’ll blatantly lie in their marketing material claiming they only use the most wholesome ingredients, because they know full well there’s no way for you to actually prove or disprove that.