Several activities are available for your dog to make sure it stays mentally and physically challenged:  http://www.dogplay.com/index.html  This site has links to 40 different activities you can do with your dog.

Especially for cats! http://catagility.com/about/cat_agility.html

Agility

https://www.usdaa.com/aboutUs.cfm

http://www.k9tdaa.com/

http://agilek9s.net/calendar/

http://www.nadac.com/

http://www.asca.org/

http://www.docna.com/default.aspx

http://www.dogsport.ru/mode.2037-l.1

Learn how to get started in agility:

http://www.akc.org/pdfs/events/agility/Agility_Brochure.pdf

Flyball http://www.ocflyball.org/Welcome.html

Dog Scouts http://www.dogscouts.org/

Schutzhund http://www.germanshepherddog.com/

Skijoring http://www.skijornow.com/skijornowhome.html

The official site of the Iditarod http://www.iditarod.com/

Hereditary disease by breeds http://www.offa.org/

Dog/cat wheelchairs. Please, let me help you with the fitting of your pet's cart/wheelchair for better results.

http://www.eddieswheels.com/index.html

http://www.walkinwheels.com/ 

Handicapped pet products http://handicappedpets.com 

Obesity
www.petobesityprevention.com/about_us.htm  

http://www.sparkpeople.com/landing_free_plus_ajc.asp  Count your pet’s calories as well as yours