Wow, I was just talking to DH about worms tonight!

My MIL for some strange and unexplained reason decided to phone me today (she lives 7 hours way) and ask if I had wormed the kids lately and if my niece had been wormed lately as my SIL has a dog.
You can't even catch them from dogs, can you?
Are there any other symptoms, besides scratching? As far as I know my kids have never had worms...well, I've never wormed them Oh dear, in 16 years I have never wormed my kids.

They have had heaps of head lice though