Tamborine raises an interesting point - that the diet of the animals we eat may have an effect on our digestive systems.
Aside from that, you are into society's tabboos here.
Because we see dogs as pets and cuddly and friendly, the notion of eating them is repulsive. It's all down to 'image'.
Everyone goes "Aaaah" at the sight of a baby seal, which would bite your fingers off ig you tried to cuddle it, and "Ugh!" at a praying mantis which is harmless.
I can see that the notion of a dog farm would be impractical, both from the point of view of dogs as unsuitable animals for farmking, and the outcry there would be if anyone tried it anywhere in the Western world.
Tastes are chaning though - imagine the notion of suchi taking off here even ten years ago, but now it is a highly fashionable form of dining.
As a nation which relishes dead animal fat on toast (dripping anyone?) maybe we should not be keen to point fingers, so I can appreciate that you have an adventurous spirit - but look out for some of the radical veggies who hit the site later on!