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I was very surprised to find the first part of this answer, and am excited to share it.
Your source's wording of "not generally supported," which is so unsatisfactory to you, is actually worded perfectly. Because it appears there is no (written) iconographical canon in the Orthodox Church.
From the Orthodox Arts Journal (emphasis mine):
Despite its heavy (Roman) legalistic and imperial heritage, the Byzantine Church, as it seems, never attempted a legal codification of its artistic production. The only area where we might find such a thing is in (post-Byzantine) painters’ manuals, which—at some point—actually gave the impression that “Greek” art was executed primarily through obeying prescriptions. However, apart from most of the texts that deal with technical issues, the instructions for the practice of painting are “general canons”— applicable to quite diverse stylistic solutions. Even in the most famous manual, compiled by Dionysius of Fourna, for example, where there is a recipe for mixing the colors for painting the face, and norms for the proportions of the human figure, the author subverts any concept of a rule, since he states that this is only one among many possibilities (although he usually starts with the way of Panselinos). As soon as the reader runs into prescriptions for painting in some other style—Cretan or Muscovite, for example—it becomes clear that the prescriptions are not binding. Thus, apart from the most general rules, for instance, that the icon should be painted in layers (usually from darker to lighter tones), it is hard to find anything more specific in those books. More precisely, we cannot find there any set of direct prescriptions on producing an icon that would be “canonical” in the narrow sense.
Of course (as the article goes on to say), just because there is no written word tradition does not mean there is no written visual tradition. Of course there is. We have burial icons surviving from the 3rd century. If your icon looks different from everything preceding you in Orthodox Christian art, perhaps consider why your style is so important that it needs to depart from those who have gone before you.
Some icons are so controversial that they merit specific censure from a church. A 1667 Synod of Moscow forbade depicting God the Father, although plenty of Russian churches (hardly ever the Greek ones, ironically) do depict "the Ancient of Days"...some people argue that that is different, others don't. I myself have been in a monastery in the United States(!) with such a depiction.
Similarly, a Holy Synod in 1722 banned depicting St. Christopher with a dog head. However, this should be understood in the context of Peter the Great's modernizing efforts and have no real theological basis. They remained popular among Old Believers, and in 1971 the restrictions on Old Believer icons was lifted.
So it appears that there are no canons; there does exist a line of tradition, and it's no longer anathematized. As long as it is not done mockingly, why not?
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Yes, according to the very detailed discussion on the Orthodox Arts Journal.
Source: Understanding The Dog-Headed Icon of St-Christopher
History and special aspects of hagiography icons in brief
Source: History and Special Aspects of Hagiography Icons in Brief
Icons blessed by Metropolitan Siluan Siberia Strijewski used in temples and churches within Russia.
Upvote:1
Is the Dog-Headed icon of Saint Christopher canon in the Orthodox Church?
If you go by Wikipedia the answer seems to be no.
Saint Christopher (Cynocephaly)
In the Eastern Orthodox Church, certain icons covertly identify Saint Christopher with the head of a dog. Such images may carry echoes of the Egyptian dog-headed god, Anubis. Christopher pictured with a dog's head is not generally supported by the Orthodox Church, as the icon was proscribed in the 18th century by Moscow.
The roots of that iconography lie in a hagiographic narrative set during the reign of the Emperor Diocletian, which tell of a man named Reprebus, Rebrebus or Reprobus (the "reprobate" or "scoundrel") being captured by Roman forces fighting against tribes dwelling to the west of Egypt in Cyrenaica and forced to join the Roman numerus Marmaritarum or "Unit of the Marmaritae", which suggests an otherwise-unidentified "Marmaritae" (perhaps the same as the Marmaricae Berber tribe of Cyrenaica). He was reported to be of enormous size, with the head of a dog instead of a man, both apparently being typical of the Marmaritae. He and the unit were later transferred to Syrian Antioch, where bishop Peter of Attalia baptised him and where he was martyred in 308. It has also been speculated that this Byzantine depiction of St. Christopher as dog-headed may have resulted from a misreading of the Latin term Cananeus (Canaanite) as caninus, that is, "canine".
The late 10th century German bishop and poet Walter of Speyer portrayed St. Christopher as a giant of a cynocephalic species in the land of the Chananeans (Canaan in the New Testament) who ate human flesh and barked. Eventually, Christopher met the Christ child, regretted his former behavior, and received baptism. He, too, was rewarded with a human appearance, whereupon he devoted his life to Christian service and became an Athleta Christi, one of the military saints.
Some sources claim this to be a popular iconic feature, in Catholic circles, yet I have never heard of it until now! This form of imagery is quite rare.
I do not think it would ever be become canon in either Catholic of Orthodox Churches.
Even the source mentioned in the question does not give a cited source or linked reference.
If it is not generally supported by the Orthodox Church, it can not be canon.