If I catch worms from my puppy, how long before I start showing symptoms?

you may not notice symptoms for awhile. Worms attach themselves to the intestine and rape your nutrients from you. You may notice less energy than usual. If you have the flexibility you can turn yourself upside down and look at your anus to see if you can spot any of the nasty 'white wigglers'. The best thing to do is to regularly pup regularly and follow proper flea eradication methods. Wash your hands alot. Make sure you get yourself a dewormer from your pharmacy. This is more common than most people realize. And then of course there are the 'tards who think you can't get worms from companion animals. Its called zoonosis!

You won't catch worms from your dog.

But that's not the question..

Why does your dog have worms the haven't been treated yet?