If we didn't eat meat or drink milk how many animals do you thing would live in our fields??
People wouldn't keep them for pets.
I've worked on many farms in my life (used to be a agricultural engineer fitting milking parlours etc) and I know that most of the animals on English farms are well kept and happy, ok their ending is a bit grim but their lives up until then are ok, if we didn't need them they wouldn't get a life at all.
So do your bit and eat one so that it gets a life