Fetch log from Palo Alto Firewall

Log Analyzer can receive and process syslogs from all devices if the syslogs meet RFC requirements. Does Palo Alto use any special syslog format?

Palo Alto uses two Syslog message formats, either BSD format which is over UDP or IETF format over TCP or SSL/TLS. 

Well, there is just general LA documentation related to your question: https://documentation.solarwinds.com/en/success_center/la/content/la/la-configure-devices-to-send-messages.htm

And the secure syslogs: https://documentation.solarwinds.com/en/success_center/la/content/lm/la-securesyslogsettingsexternal.htm

If you're not sure (and since nobody else, possibly having PA devices, replied), you can dowlnoad a trial version and try it yourself: www.solarwinds.com/log-analyzer