Question: Are the Maremma Sheepdog and Can de Palleiro both shepherd dogs?

Context articles: Arthur (dog)
Schutzhund
East-European Shepherd
Can de Palleiro
Caucasian Shepherd Dog
Old German herding dogs
Panda German Shepherds
Maremma Sheepdog
Belgian Shepherd
Masticatory muscle myositis

Arthur is an Ecuadorian street dog who attached himself to a Swedish extreme sports team when they were competing in the Adventure Racing World Championship in 2014, and now lives in Örnsköldsvik, Sweden and has inspired a foundation to help other Ecuadorian street dogs.
 According to his owner Mikael Lindnord, Arthur is presumed to be a Maremma Sheepdog mix.
Schutzhund (German for "protection dog") is a dog sport that was developed in Germany in the early 1900s as a breed suitability test for the German Shepherd breed.
 The test would determine if the dog displayed the appropriate traits and characteristics of a proper working German Shepherd.
 Today, it is used as a sport where many breeds other than German Shepherd Dogs can compete, but it is such a demanding test that few dogs can pass.
The East European Shepherd (VEO) (in Russian: Восточно-европейская овчарка (ВЕО)) —is a breed of dog that was developed in the 1930-1950s based on German Shepherd Dogs to create a larger cold-resistant breed for military use, police work and border guard duties in the Soviet Union.
 VEOs are also used as guide dogs for the blind and there are VEO therapy dogs.
 This breed is popular in Russia where it entered a public culture and acquired a legendary status as an extremely smart and loyal dog devoted to their owners.
 The breed is well known in other ex-Soviet Union republics.
 In the West, the East-European Shepherd is a rare breed that is not well known: information about the breed on online sources, in English, is limited and often incorrect or distorted.
Can de Palleiro or Pastor Galego also known as Galician Shepherd Dog or Galician Palleiro is a dog breed originating in Galicia (Spain).
The Caucasian Shepherd Dog (Adyghe: Хьэпарий, "Khʹèparij", Адыгэ Мэлыхъуэхьэ, "Adygè Mèlykhʺuèkhʹè" ; Karachay-Balkar: Басхан Парий, "Baskhan Parij" ; Armenian: Կովկասյան հովվաշուն, "Kovkasyan hovvašun" ; Azerbaijani: "Qafqaz çoban iti" ; Georgian: კავკასიური ნაგაზი, "Kavkasiuri nagazi" ; Turkish: "Kafkas Çoban Köpeği" ; Ossetian: Аргъонахъ, "Arghonaq" ; Russian: Кавказская овчарка, "Kavkazskaya ovčarka" ) is a large breed of dog that is popular in Russia, Armenia, Azerbaijan, and Georgia.
 It is extremely popular in Georgia, which has always been the principal region of penetration of Caucasian shepherd dogs.
 The official standard of this breed is fundamentally based on the dogs taken from Georgia.
The old German herding dogs (German: "altdeutsche Hütehunde" ), including old German sheep-dogs or old German shepherd dogs (altdeutsche Schäferhunde ) are a group of traditional types of working, herding dogs from Germany.
 They are landraces consisting of working strains of dog, and some of them are the types from which the modern German Shepherd Dog was developed as a standardised breed.
 The landraces are not recognised by the Fédération Cynologique Internationale but some have their own standards, which are for working ability not appearance traits.
"Panda German Shepherds" is a term coined for German Shepherd Dogs that exhibit a rare genetic mutation that causes white spotting the traditionally non-white marked breed of German Shepherd Dogs.
 This frequently debated color is often dismissed as a result of crossbreeding.
 However, new research has proven insightful of the true origin of this new marking.
The Maremma Sheepdog, in Italian Cane da pastore Maremmano-Abruzzese, is a breed of livestock guardian dog indigenous to central Italy, particularly to Abruzzo and the Maremma region of Tuscany and Lazio.
 It has been used for centuries by Italian shepherds to guard sheep from wolves.
 The literal English translation of the name is "The dog of the shepherds of the Maremma and Abruzzese region".
 The English name of the breed derives from that of the Maremma marshlands, where until recently shepherds, dogs and hundreds of thousands of sheep over-wintered, and where the breed is today abundant although sheep-farming has decreased substantially.
 The breed is widely employed in Abruzzo, where sheep herding remains vital to the rural economy and the wolf remains an active and protected predator.
 Similar breeds include the Pyrenean Mountain Dog, the Kuvasz of Hungary, the Tatra of Poland, the Cuvac of Slovakia and the Šarplaninac (although not white), with all of which it may share a common ancestor; and the Akbash Dog of Turkey.
The Belgian Shepherd (also known as the Belgian Sheepdog or Chien de Berger Belge) is a breed of medium-to-large-sized herding dog.
 It originated in Belgium and is similar to other sheep herding dogs from that region, including the Dutch Shepherd, the German Shepherd, the Briard, and others.
 Four types have been identified by various registries as separate breeds or varieties: Groenendael, Laekenois, Tervuren, and Malinois.
Masticatory muscle myositis (MMM) is an inflammatory disease in dogs affecting the muscles of mastication (chewing).
 It is also known as atrophic myositis or eosinophilic myositis.
 MMM is the most common inflammatory myopathy in dogs.
 The disease mainly affects large breed dogs.
 German Shepherd Dogs and Cavalier King Charles Spaniels may be predisposed.
 There is a similar disease of the eye muscles found in Golden Retrievers. Symptoms of acute MMM include swelling of the jaw muscles, drooling, and pain on opening the mouth.
 Ophthalmic signs may include third eyelid protrusion, red eyes, and exophthalmos (protruding eyeballs).
 In chronic MMM there is atrophy of the jaw muscles, and scarring of the masticatory muscles due to fibrosis may result in inability to open the mouth (trismus).
 The affected muscles include the temporalis, masseter, and pterygoid muscles.
 The disease is usually bilateral.