A recent tv programe about dogs showed an incredibly nast chihuahua that had ben treated as a toy; I'm sure your sister isn't doing so with her dog but they really do need to realise who's pack leader from a very early age. I can remember my whippet accidentally slicing my finger open like a sharp knife when she was a puppy when we both went for a ball at the same time, because her teeth were like razors.
Why do people lie online are they living a fantasy or winding us up?

