I think we need a place to compile the parts of the site that still use the Legacy URLs rather than the IDs or modern URLs. The feedback thread doesn't seem like the right place as it's more for opinions rather than outdated/"broken" areas. My apologies if a thread like this already exists, I couldn't find one when I looked.

I've found two locations so far that use the old URLs that are/will be a problem:

Pet Friends: Since you have to use the pet's name to add them as a friend on your pet's profile, this feature only adds the Legacy pet to that list. Fixed!

The Pet Spotlight pages (not posts): All the past winners noted in the Pet Spotlight area of the site uses legacy name URLs, which will be a problem as more name changes and newer pet wins occur.