The comment about eating dogs is a reference to China, not Russia. In Chinese culture, the consumption of dog meat is considered perfectly acceptable, just as here on the European mainland, the consumption of horse meat is also considered perfectly acceptable, while that in turn is considered abominable and shocking in the Anglo-Saxon countries. I myself have actually already eaten horse meat on a few occasions — a long time ago, though — and it actually tastes very good. It's also very healthy, because it contains a lot of iron.
Everything is cultural in that regard. In Australia — and especially among the Aboriginals — kangaroos are considered edible wildlife. In certain African countries, even monkeys are caught for food — which, given their close genetic ties to humans, is an absolute and definitive no-no for myself as an individual. Back in the nineties, restaurants here in Belgium were offering kangaroo steaks and crocodile steaks — both of which I refused to try.
Certain people in Africa and Asia eat giant spiders. Even here in the West, the idea of consuming insects has been actively promoted in still recent times. And certain people — especially in France, but it's not uncommon here in Belgium either — eat snails. As the matter of fact, one of my ex-girlfriends would go ecstatic about snails in garlic butter — myself, I wisely opted not to partake in her culinary pleasure.
During both World Wars, some people over here would kill, cook and eat stray cats. It is said that, once cooked, if they don't let you see the head and the tail, then you cannot tell it apart from rabbit stew.
About 20 years ago, my brother went on a survival training course in Spain, and part of his training was to survive in the woods over there for a whole week without any food or water supplies. All he had with him was a knife and a compass. So he set traps, and he ate squirrels, rabbits and worms, along with whatever fruit, edible mushrooms and plants he could find.
Myself, I would politely decline on the offer, but like I said, it's all cultural, and famine is also an important factor in that regard. As repulsive as some of those dietary habits may be, at least it's not as bad yet as cannibalism.