Dog parks or just parks in general? I regularly visit parks, but not dog parks so I'm not familar with those.
Some good parks:
Washington Square (probably the best IMO as it's just as large as the others but not as busy as Rittenhouse)
Rittenhouse Square (very nice but always very very busy)
Franklin Square
Some dog boutiques:
http://doggiestyle2.com/ http://www.bonejourpetsupply.com/
(both of these are relatively close to Washington Square and Franklin Square. Doggie Style has a store close to Rittenhouse)
There are a few more but the names are escaping me. I know there is one in the art museum area but I can't remember the name.
I'm sure luv_my_yorkies and others might have some other suggestions.
Let me know if you have any other questions, comments, and/or suggestions.
ETA:
http://www.dogfriendly.com/server/tr...adelphia.shtml