Animals are suffering and you are trying to rationalize a way this with argumentation based on your thoughts, not based on what the animals are feeling or are going through.
You are not putting yourself in their position! You are not even trying to feel what they are feeling!!!
Many people understand how much a dog can suffer. Cows, sheep, pigs and other animals are no different.
If you just want to understand the animal's perspective, instead of coming with insensitive and careless rationalizations of a barbaric human practice (i.e. the animal consumption), then please Google cows and suffering and see some video footage.
Killing an innocent, sentient being is always cruel and barbaric. There is no such thing as “humane” slaughter.