"Your dog is your best friend"

This is the problem right here. If you have a dog for some practical reason (eg herding sheep) you keep it intact to produce future generations & sell the extras.

Once a dog becomes a replacement for human companionship its vitality becomes secondary. It's just a living teddy bear for you to hug. 

 it was figure of speach to make point. dogs are companions not frens. frens have thumbs
 

 point is. leave their nads alone. just dont let them run around and breed.