As of August 1, 2008, players can access the exchange by going to https://love.pet/ in a web browser on a mobile device and then Trade Center:

The exchange allows players to sell, purchase or exchange pets.

In the ‘Trade Market’ tab, players can offer to buy or sell their level 10 dogs in exchange for GTC tokens:

In the ‘Exchange Market’ tab, players can trade their level 1 dogs for other level 1 dogs:

Currently, there are no ways to trade or exchange level 2–9 dogs although this may be implemented in future.

The release of the pet exchange is one week ahead of the full launch of the Pet Planet (love.pet) game which is set for August 8, 2018.