Because you are a good friend, I went out and did a small research for you and here are some of the best apps I could find. (If you landed from Google please note this top was made in 2011, new apps might be available since).
So Alex, enjoy my recommendations and let me know which one is you favorite.
Dog First Aid for iPhone
$1.99by By PetMD
Fido Factor – Dog Friendly Guide for iPhone
free appby By Appetyte
Dogs PRO – NATURE MOBILE for iPhone
$3.99by By Alphablind Studio
Pet Services Finder for iPhone
free appby By PetMD
Dog Whistler – Your Free Dog Whistle for iPhone
free appby By Mobeezio, Inc.