John Gills Exposition of the Bible Commentary - Proverbs 26:11
As a dog returneth to his vomit ,.... Who being sick with what he has eaten, casts it up again, and afterwards returns unto it and licks it up; so a fool returneth to his folly , or "repeats" F1 שונה "qui iterat", Tigurine version, Michaelis; "iterans", Montanus, Mercerus, Cocceius, Gejerus; "duplicans", Schultens. it, time after time, many times, as Ben Melech; or a wicked man turns to his wickedness, who, having had some qualms upon his conscience for sin, for a while... read more
Matthew Henry's Complete Commentary - Proverbs 26:11
See here, 1. What an abominable thing sin is, and how hateful sometimes it is made to appear, even to the sinner himself. When his conscience is convinced, or he feels smart from his sin, he is sick of it, and vomits it up; he seems then to detest it and to be willing to part with it. It is in itself, and, first or last, will be to the sinner, more loathsome than the vomit of a dog, Ps. 36:2. 2. How apt sinners are to relapse into it notwithstanding. As the dog, after he has gained ease by... read more