See @BlameTheParrot's bit.ly link in the post above.
Find the page for Snowy Street. The page you initially see has all the outdoor chewing gum locations marked.
Swipe over for the indoor locations in the smaller buildings. Swipe over again for the locations inside the larger building where the puppies are located.
If that doesn't get you back on track, be sure to contact Support right away. This event is almost over.
On your game screen, choose the Settings wheel in the upper corner. Write down your Player ID and then choose the Support button. Scroll all the way down to the bottom of the page until you see a list of categories. (Do not use the white text box in the top half.) Choose a category and then provide your Player ID, WebGL vs. Mobile, and problem details.
If you are using an iOS device and you do not see the category options on the SUPPORT page, you'll need to email PIXEL Support at: email@example.com