Taking care of a dog is a life-time-commitment, just like taking care of one's children.
If one isn't prepared for this commitment one shouldn't adopt a dog.
are dogs getting killed each day at a animal shelter that one can save:
are looked upon as objects by the farmers - objects that don't mind of
getting killed. The small family-farmers will have to sell their male
calves to other persons and they will inevitably end up at someone's
dining plate :(. This is how cows are treated. The only guarantee and
safe-haven for a cow would be at the home of a vegan, but family farmers
who eat meat don't have any moral objection of cows getting killed and
no incentive to ensure this.
If one's is selling the cow to someone
involved in the diary-industry one is supporting and helping to keep the
inhumane and life-taking diary-industry alive.
Having a cow should be a life-time-commitment, just like taking care of one's children.
This is only one reason why there is no such thing as "human milk"