The interpretation timeline
Isaiah 56:10 Douay-Rheims

His watchmen are all blind, they are all ignorant: dumb dogs not able to bark, seeing vain things, sleeping and loving dreams.

A.D. 379 – 1875 9 witnesses

Patristic

before A.D. 750
379
A.D.
Basil of Caesarea Patristic
c. A.D. 330–379
“In souls, pure and cleansed from all defilement, the prophetic gift shines clear. In a foul mirror you cannot see what the reflection is, neither can a soul preoccupied with cares of this life and darkened with the passions of the lust of the flesh receive the rays of the Holy Spirit. Every dream is not a prophecy, as Zechariah says, "The Lord shall make bright clouds and give them showers of rain … for the idols have spoken vanity, and the diviners have spoken false dreams." Those who, as Isaiah says, "dream and love to sleep in their bed" forget that an instigation of error is sent to "the children of disobedience."”
Source
407
A.D.
John Chrysostom Patristic
A.D. 347–407
“Hence even sacred Scripture, with these sorts of disturbing passions in mind, in many places applies the names of brutes and of wild beasts to those gifted with reason; sometimes it calls them "dogs" on account of their shameful and headstrong behavior—"dumb dogs," since they are "unable even to bark."”

Medieval

c. 750 – 1100
850
A.D.
Ishodad of Merv Medieval
d. A.D. 850
“"They are all stammering dogs" who stutter the praise of God and "cannot bark" against the idols, as against strangers. "They dream, lay down and love to slumber," that is, they love to sleep in the graves and in the places where sacrifices are offered to demons, and there they expect from them visions, dreams and ghosts.”
Source

Scholastic

c. 1100 – 1500
1105
A.D.
Rashi Jewish
1040–1105
“His lookouts are all blind Since he said, “Seek the Lord,” and the entire section, and they do not heed, he returns and says, Behold the prophets cry out to them ([Mss.:] to you) and announce concerning repentance, so that it will be good for them. Yet their leaders are all like blind men, and they do not see the results, like a lookout appointed to see the approaching army, to warn the people, but he is blind, unable to see whether the army is coming, and dumb, unable to warn the people, like a dog that was appointed to guard the house, but he is dumb, unable to bark. Similarly, the leaders of Israel do not warn them to repent to do good. they lie slumbering Heb. הֹזִים. Dunash (Teshuvoth Dunash p. 24) explained: lying sound asleep, and Jonathan rendered: lying slumbering, and there is no comparable word in Scripture.”
Source
1167
A.D.
Ibn Ezra Jewish
1089–1167
“His watchmen are blind, etc. The false prophets in Israel are meant, who were like blind watchmen during the day, and like dumb dogs during the night, that cannot guard the house and are of no use whatever. לנבח To bark. The word has in Arabic the same meaning. הזים Dogs. It is hap. leg.; the ה is radical as in הורו והנו conceiving and uttering (59:13). The participle Hiphil has always מ at the beginning.—R. Jonah says that the Targum renders הזים by ניימין slumbering, because dogs are more addicted to slumber than all other animals. Loving the slumber. Repetition of the same idea.”
Source
1256
A.D.
Thomas Aquinas Catholic
1225–1274
“Thus says the Lord. Here, after he had promised liberation from evils, he begins to promise salvation in the conferring of goods. And it is divided into three parts. In the first is set down the preparation for salvation; in the second, the promise of salvation, chapter 60: Arise, be enlightened; in the third, the great discernment of the salvation conferred, chapter 63: Who is this. The first into two. In the first is set down the preparation on the part of the one receiving salvation; in the second, on the part of the one saving, chapter 59: Behold, it is not shortened. The first into two. In the first he gives the wholesome counsel of preparation; in the second he excludes the vain remedy, chapter 58: Cry, cease not. The first into two. In the first he sets down the diversity of those who receive the counsel, as regards the establishment of rewards; in the second, as regards the escape from dangers, chapter 57: the just man perishes. The first into three. In the first he sets down the counsel; in the second, the fruit of the counsel in those who receive it, Blessed is the man who does; in the third, the failure of salvation in those who despise it, all you beasts. Concerning the first he does two things. First he counsels the due preparation: keep judgment, you prelates, whose office it is to judge; do justice, you subjects, that is, every virtue, according as one is conformed to another by the precepts of the law. Micah 6: I will show you, O man, what is good. Second he promises the nearness of salvation: for near, that is, close, is my salvation, because you will be saved by me after the captivity, and my justice, as regards the enemies of whom I will avenge you. Above, 46: I have brought my justice near. Blessed is the man. Here he sets down the fruit of the counsel in those who receive it: and first he sets down its usefulness, setting down the fruit of fulfillment: blessed is the man who does, fulfilling in deed, who lays hold, vigorously undertaking. Psalm 111: blessed is the man who fears the Lord; and the manner of fulfilling, as regards ceremonial matters, keeping the sabbath: for the observance of the sabbath was moral as regards this, that rest is placed in God, and that one is at some time free for divine things by abstaining from other things; but it was ceremonial as regards the determination of the time. Now the seventh day was determined for them on account of the work of creation, than which nothing more worthy had yet preceded. For us, the first day, or the eighth, on account of the mystery of the resurrection, by which nature once founded is repaired for the better. Exodus 20: remember to keep holy the sabbath day. Jeremiah 17: keep your souls. And as regards moral matters, keeping the hands. Psalm 25: I will wash my hands among the innocent. Second he sets down the universality of its usefulness, and let him not say: and first he excludes the despair of certain ones who seemed unworthy, whether on account of a defect of lineage, because they were not of the race of Israel. Who adheres, keeping his precepts. By separation, not making me a partaker of the salvation promised to them. Romans 10: for there is no distinction of Jew and Greek: for the same is Lord of all. Or on account of a defect of the generative power: and let not the eunuch say: a dry tree, powerless to beget, as a dry tree is powerless to sprout. Proverbs 11: the just, like a flourishing leaf. Second he sets down the promise: for thus says the Lord. And first to them specially, as regards the eunuchs: they shall have kept, as regards the worship of religion; they shall have chosen, as regards obedience to the law; they shall have held fast, as regards the observance of the promise of abstaining from evils: within the walls, that is, a dwelling within the walls of my city; a better name, in that they shall be called my servants and holy ones; and than sons, as if they had begotten many sons. Wisdom 3: the eunuch who has not wrought. And as regards the strangers: and to sons, that is, I will give the privileges in which the Jews glory, that they may worship, as regards special worship, and love, as sons, that they may be as servants, and glory in his dominion. Above, 19: they shall worship the Lord. And these things indeed were fulfilled in the return of the people from the captivity; but more fully in the conversion of the nations to the faith of Christ, as the Gloss explains. Second, as regards all in general: every one who keeps. And concerning this he does two things. First he sets down the promise, by which he promises the restoration of the sacred place: to the holy mountain. Namely, as above, 1: come, let us go up to the mountain of the Lord. And as regards the acceptance of sacrifices: holocausts. Malachi 3: the sacrifice of Judah and Jerusalem shall be pleasing to God. Second he sets down the order of fulfillment: and first as regards the veneration of the temple: for my house. 2 Maccabees 3: the temple throughout the whole. John 2 and Matthew 21: my house shall be called a house of prayer. Second, as regards the gathering of the people: says the Lord, to him; he gathers Israel, the nations adhering to him. Psalm 146: the Lord, building up Jerusalem, will gather the dispersions of Israel. Note on that word, and I will give a better name, that the saints have a name, first from predestination. Above, 49: the Lord has called me from the womb; second, from divine attainment. 1 John 3: behold what manner of love or charity God the Father has given us, that we should be called, and should be, sons of God. Third, from the infusion of grace. Apocalypse 2: you have a name, and you hold my name. Fourth, from the renewal of the mind. In the same place, Apocalypse 2: I will give a stone. Also note, that the name of God is to be loved: first, because it is great, so as to be feared. Malachi 1: my name is great among the nations, says the Lord. Second, because it is holy, so as to be venerated. Luke 1: he who is mighty has done great things for me, and holy is his name. Third, because it is sweet, so as to be meditated upon. Above, 26: your name and your memorial are in the desire of the soul. Fourth, because it is abundant, so as to show mercy. Canticle 1: your name is oil poured out. Fifth, because it is efficacious, so as to obtain. John 15: whatsoever you shall ask the Father in my name, he will give you. Sixth, because it is powerful, so as to save. Acts 4: there is no other name under heaven whereby we must be saved. Seventh, because it is hidden, so as to be known. Proverbs 30: what is his name. All you beasts of the field. Here he threatens those who despise it with the failure of salvation: and first he designates the punishment of slaughter: all beasts, to devour, their corpses. Ezekiel 39: speak to every bird, to all. Second he sets down the fault: and first, of the prelates, as regards their failure in government and in foreseeing dangers. Watchmen: for prelates are set up to guard the people from dangers, as a watchman guards against enemies: they have not known, to foresee dangers. Matthew 15: let them alone: they are blind leaders of the blind. In the correction of vices, all of them dogs. To bark, against vices. Psalm 37: but I, as a deaf man, heard not, and as a dumb man, not opening his mouth. In the admonition of things to be done, seeing vain things, promising them prosperous things when adverse things were imminent; and thus nourishing them in sins. Ezekiel 22: her prophets daubed them. In the plundering of goods, and most shameless dogs; as if, without any restraint of shame, despoiling their subjects of their goods, and never satisfied. Psalm 58: they shall suffer hunger like dogs. And as regards their failure in the perfection of knowledge: they, the shepherds, understanding, of the law and the prophets. Proverbs 1: the intelligent man shall possess the helm. Psalm 81: they have not known nor understood; they walk on in darkness. Second, the fault of the subjects, or of all in common: and first, as regards their own will, which pertains to pride: all, into his own way. Jeremiah 16: every one walks. Second, as regards their covetousness, which pertains to avarice: every one. Jeremiah 6: from the least even to the greatest, all are given to avarice. Third, as regards pleasure, which pertains to the concupiscence of the flesh: come. And it shall be; that is, if today we rejoice in such things, tomorrow much more. Above, 22: and behold joy and gladness, killing calves and slaying rams, eating flesh and drinking wine.”

Post-Reformation

c. 1650 – 1900
1849
A.D.
1774–1849
“Watchmen. Priests and prophets. (Calmet) — We know (Haydock) only Jeremias who continued firm, Lamentations ii. 14. In the days of Christ, the corruption was not diminished. (Calmet)”
1871
A.D.
1871
“His watchmen--Israel's spiritual leaders (Isa 62:6; Eze 3:17). dumb dogs--image from bad shepherds' watchdogs, which fail to give notice, by barking, of the approach of wild beasts. blind-- (Mat 23:16). sleeping, lying down--rather, "dreamers, sluggards" [LOWTH]. Not merely sleeping inactive, but under visionary delusions. loving to slumber--not merely slumbering involuntarily, but loving it.”
Source
1875
A.D.
Keil & Delitzsch Lutheran
1861–1875
“The prophet now proceeds with צפו (צפיו): the suffix refers to Israel, which was also the object to לאכל. "His watchmen are blind: they (are) all ignorant, they (are) all dumb dogs that cannot bark; raving, lying down, loving to slumber. And the dogs are mightily greedy, they know no satiety; and such are shepherds! They know no understanding; they have all turned to their own ways, every one for his own gain throughout his border." The "watchmen" are the prophets here, as everywhere else (Isa 52:8, cf., Isa 21:6, Hab 2:1; Jer 6:17; Eze 3:17). The prophet is like a watchman (tsōpheh) stationed upon his watch-tower (specula), whose duty it is, when he sees the sword come upon the land, to blow the shōphâr, and warn the people (Eze 33:1-9). But just as Jeremiah speaks of bad prophets among the captives (Jer 29), and the book of Ezekiel is full of reproaches at the existing neglect of the office of watchman and shepherd; so does the prophet here complain that the watchmen of the nation are blind, in direct opposition to both their title and their calling; they are all without either knowledge or the capacity for knowledge (vid., Isa 44:9; Isa 45:20). They ought to resemble watchful sheep-dogs (Job 30:1), which bark when the flock is threatened; but they are dumb, and cannot bark (nâbhach, root nab), and leave the flock to all its danger. Instead of being "seers" (chōzı̄m), they are ravers (hōzı̄m; cf., Isa 19:18, where we have a play upon החרס in ההרס). הזים, from הזה, to rave in sickness, n. act. hadhajan (which Kimchi compares to parlare in snno); hence the Targum נימים, lxx ἐνυπνιαζόμενοι A φανταζόμενοι, S ὁραματισταί, Jer. videntes vana. The predicates which follow are attached to the leading word hōzı̄m (raving), if not precisely as adjectives, yet as more minutely descriptive. Instead of watching, praying, wrestling, to render themselves susceptible of visions of divine revelations for the good of their people, and to keep themselves in readiness to receive them, they are idle, loving comfortable ease, talkers in their sleep. And the dogs, viz., those prophets who resemble the worst of them (see at Isa 40:8), are נפשׁ עזּי, of violent, unrestrained soul, insatiable. Their soul lives and moves in the lowest parts of their nature; it is nothing but selfish avarice, self-indulgent greediness, violent restlessness of passion, that revolves perpetually around itself. With the words "and these are shepherds," the range of the prophet's vision is extended to the leaders of the nation generally; for when the prophet adds as an exclamation, "And such (hi = tales) are shepherds!" he applies the glaring contrast between calling and conduct to the holders of both offices, that of teacher and that of ruler alike. For, apart from the accents, it would be quite at variance with the general use of the personal pronoun המה, to apply it to any other persons than those just described (viz., in any such sense as this: "And those, who ought to be shepherds, do not know"). Nor is it admissible to commence an adversative minor clause with והמה, as Knobel does, "whereas they are shepherds;" for, since the principal clause has הכלבים (dogs) as the subject, this would introduce a heterogeneous mixture of the two figures, shepherds' dogs and shepherds. We therefore take רעים והמה as an independent clause: "And it is upon men of such a kind, that the duty of watching and tending the nation devolves!" These רעים (for which the Targum reads רעים) are then still further described: they know not to understand, i.e., they are without spiritual capacity to pass an intelligible judgment (compare the opposite combination of the two verbs in Isa 32:4); instead of caring for the general good, they have all turned to their own way (ledarkâm), i.e., to their own selfish interests, every one bent upon his own advantage (בּצע from בּצע, abscindere, as we say, seinen Schnitt zu machen, to reap an advantage, lit., to make an incision). מקּצהוּ, from his utmost extremity (i.e., from that of his own station, including all its members), in other words, "throughout the length and breadth of his own circle;" qâtseh, the end, being regarded not as the terminal point, but as the circumference (as in Gen 19:4; Gen 47:21, and Jer 51:31).”
Source
Modern · 1953 →

The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.