If you have two pets that need to be adopted together, you can post them as a bonded pair. Then, when adopters open either of the two pets' details pages for more information, they'll also see a very small photo of the other half of the pair, along with a link to that pet's page as well!
To add a bonded pair you can do one of two things:
1) Add the first pet and make sure to check off "part of bonded pair" and select the type of pet for the other half of the pair. After you click "submit", a new "add a pet" form will open. Fill out that form with the second pet's information.
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2) You can also bond two pets that have already been added to the site. Simply open an existing pet's edit page and click "part of bonded pair". You'll be asked to select the second pet's name from a list. This option also works if you're adding a new pet who needs to be bonded to an existing pet in your pet list.
You can always un-bond a pair by clicking "unbond this pair" from either of the pets' edit pages.