RE: Internal server Error
Ok. This is really puzzling me. If you were able to run the installer and upgrader than that means whatever is blocking the site or causing the 500 error most likely is in the pets folder, as you seem to be able to access pets/install and pets/upgrader but just not pets/ by itself.
Try deleting all of the files in the pets/ folder with the exception of inc/config.php and then re-upload all of the files fresh from the download. I don't know if this will help at all or not, but it is worth a try.
Also, try deleting the htaccess.txt file if it exists. Also maybe check your server logs and see if anything is listed under the error log that pertains to the 500 internal server error and maybe paste that info here from the logs.
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