Hooray! Penny is home and resting after surgery to remove a lump on her chest. Thank goodness it was only a lipoma.
It's a pity Penny now has to recover from an anaesthetic, but while she was under, the vet also cleaned her teeth and took off another lump from the top of her head, so I guess it was worth it.
Now we'll have to nurse her back to her usual energetic self.
Many thanks for the encouraging comments. It's great to know that others are thinking of us, and great to hear how other families cope with these sorts of things.
I think this is one of the terrific advantages of the internet. We are not alone.