Gotta Love Those Dogs!

United States
Working Dogs
August 1, 2019
The stamp set feature artist renderings of four breeds commonly used as military working dogs: German shepherd, Dutch shepherd, Labrador retriever and Belgian Malinois.

This January 1, 2002 computer-vended stamp of Finland (Michel #38) depicts the un-domesticated version of the dog, the wolf (Canis lupus). There are only several hundred wolves, at most, in Finland today, and they continue to be culled and poached.

From the suurpedot.fi website, "The wolf (Canis lupus) is a mammal of the canine family. Biologically speaking, it is the same species as the domestic dog. The wolf is the largest canine living in the wild...Wolves communicate with each other via postures, gestures, facial expressions, scent marks and howling. Contrary to what stories tell us, wolves do not howl more than usual during the full moon. Wolves howl to signal the beginning of hunt, to guard their territory and to call the pack together."

Hungary
Our Living Heritage - Dogs
May 9, 2007
The stamp set depicts Komondor, Transylvanian Hound, Kuvasz, and Pumi.

Here is Taiwan, Republic of China's 2018 computer-vended stamp. Theme is "Year of the Dog". Stamp is of Frama (Germany) format.

This 4.40 kroon stamp (Sc. #419c) is from Estonia's June 19, 2001 booklet featuring illustrations from Edgar Valter's Pokuland book. It is the lower left stamp from a pane of four, 4.40 kr. stamps.

Here are Singapore's January 6, 2006 Chinese New Year "Year of the Dog" stamps (SG #s 1573-4). These two are from the se-tenant sheet of 18 (9 stamps of each value). Each stamp was also issued in sheets of 50.

Kazakhstan
Puppies
December 2019
The sheet of eight stamps depict bulldog, dalmatian, beagle, German shepherd, dachshund, Welsh corgi, Siberian husky, chow chow.

Finland
World Dog Show
June 4, 1998
The stamps show Bernese Mountain Dog, Pumi, German Boxer, Bichon Frise, Finnish Lapphund, Wire-haired Dachshund, Cairn Terrier, and Labrador Retriever.

This 1987, rouletted, 10 peso anti-tuberculosis charity seal of Mexico depicts a Weimaraner. The sheet from which this seal came, most likely showed many different breeds of dogs.

Modern (1960-2000) anti-tuberculosis seals of many countries are issued in se-tenant and continuous design sheets of a topical nature.

This 10 F stamp (Sc #698) from Luxembourg's 1983 "Anniversaries and Events" set of three, depicts a German shepherd, or Alsatian sheepdog. The stamp was issued to recognize the European Championship of Working Dogs held in the country.

Cuba
PHILAKOREA
June 15, 2014
The stamp set depicts poodle, Yorkshire terrier, schnauzer, beagle, German shepherd, and golden retriever.

Turkey
Service Dogs
March 4, 2020
The stamp set depicts guide dog, search and rescue dog, security dog.

On September 22, 1998 The Netherlands issued a set of three, 80c stamps showing pets. One of these stamps depicts a Dutch partridge dog, a versatile hunting dog.

Paraguay
UPAEP - Domestic Animals
October 9, 2018
The se-tenant pair depict domestic dogs.

The 2c value of South West Africa's 1980-88 wildlife series depicts the African wild dog, which is not the same species as the domesticated dog, and wolf (Canis lupus).

From Wikipedia, "The African wild dog (Lycaon pictus), also called the painted wolf or Cape hunting dog, is a canine native to the sub-Saharan Africa. It is the largest indigenous canine in Africa, and the only extant member of the genus Lycaon, which is distinguished from Canis by dentition highly specialized for a hyper-carnivorous diet, and lack of dewclaws...The African wild dog is a highly social animal, living in packs with separate dominance hierarchies for males and females. Uniquely among social carnivores, the females rather than the males disperse from the natal pack once sexually mature."