I got home and my Mac was down. It is sending this report to Apple:
Anonymous UUID:       464A9BE1-01F2-CDDA-9F2F-EF2DEBAEAE46
Tue Aug  9 19:05:36 2016
*** Panic Report ***
panic(cpu 1 caller 0xffffff7f98e3d50b): "OSX Watchdog Timeout: 29433m1/029453m1/029473m1/029493m1/029513m1/029533m1/029553m1/029573m1/029593m1/029613m1/029633m1/029653m1/029674m1/029694m1/029714m1/029734m1/029754m1/029774m1/029794m1/029814m1/029834m1/029854m1/029874m1/029894m1/029914m1/029934m1/029954m1/029975m1/029995m1/030015m1/030035m1/030037i1 0"@/BuildRoot/Library/Caches/com.apple.xbs/Sources/OSXWatchdog/OSXWatchdog-22/Source/AppleOSXWatchdog/AppleOSXWatchdog.cpp:234
Backtrace (CPU 1), Frame : Return Address
0xffffff815a483ec0 : 0xffffff80172dab52 
0xffffff815a483f40 : 0xffffff7f98e3d50b 
0xffffff815a483f80 : 0xffffff7f98e3d62d 
0xffffff815a483fb0 : 0xffffff80173c9117 
      Kernel Extensions in backtrace:
         com.apple.driver.AppleOSXWatchdog(1.0)[D0B2999C-6EB8-3E88-8CA5-60E05B6AD462]@0xffffff7f98e3c000->0xffffff7f98e3ffff
            dependency: com.apple.iokit.IOPCIFamily(2.9)[F51AA3D6-EC2F-3AD3-A043-06DB79027AA2]@0xffffff7f97ae9000
BSD process name corresponding to current thread: kernel_task
Mac OS version:
15G31
Kernel version:
Darwin Kernel Version 15.6.0: Thu Jun 23 18:25:34 PDT 2016; root:xnu-3248.60.10~1/RELEASE_X86_64
Kernel UUID: B5AA8E3E-65B6-3D0E-867B-8DCCF81E536C
Kernel slide:     0x0000000017000000
Kernel text base: 0xffffff8017200000
__HIB  text base: 0xffffff8017100000
System model name: MacPro3,1 (Mac-F42C88C8)
System uptime in nanoseconds: 46053377864575
last loaded kext at 26197352064145: com.apple.driver.CSRHIDTransitionDriver    4.4.6f1 (addr 0xffffff7f9a19a000, size 12288)
last unloaded kext at 26259106880211: com.apple.driver.CSRHIDTransitionDriver    4.4.6f1 (addr 0xffffff7f9a19a000, size 8192)
loaded kexts:
com.wdc.driver.1394_64HP    1.0.1
at.obdev.nke.LittleSnitch    4370
com.rim.driver.BlackBerryUSBDriverInt    2.2.18
com.apple.driver.AudioAUUC    1.70
com.apple.filesystems.autofs    3.0
com.apple.driver.AppleOSXWatchdog    1
com.apple.driver.pmtelemetry    1
com.apple.iokit.IOUserEthernet    1.0.1
com.apple.driver.AppleHDA    274.12
com.apple.driver.AppleUpstreamUserClient    3.6.1
com.apple.driver.AppleMCCSControl    1.2.13
com.apple.iokit.IOBluetoothSerialManager    4.4.6f1
com.apple.Dont_Steal_Mac_OS_X    7.0.0
com.apple.kext.AMDFramebuffer    1.4.2
com.apple.driver.AppleHV    1
com.apple.AMDRadeonX3000    1.4.2
com.apple.iokit.CSRBluetoothHostControllerUSBTransport    4.4.6f1
com.apple.driver.AppleLPC    3.1
com.apple.driver.AppleIntelSlowAdaptiveClocking    4.0.0
com.apple.kext.AMD5000Controller    1.4.2
com.apple.driver.ACPI_SMC_PlatformPlugin    1.0.0
com.apple.iokit.SCSITaskUserClient    3.7.7
com.apple.iokit.IOAHCIBlockStorage    2.8.5
com.apple.driver.AppleIntel8254XEthernet    3.1.4b1
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless    1.0.0d1
com.apple.driver.AppleFWOHCI    5.5.4
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib    1.0.0
com.apple.BootCache    38
com.apple.driver.usb.AppleUSBEHCIPCI    1.0.1
com.apple.driver.usb.AppleUSBUHCIPCI    1.0.1
com.apple.driver.AppleAHCIPort    3.1.8
com.apple.driver.AppleIntelPIIXATA    2.5.1
com.apple.driver.AppleACPIButtons    4.0
com.apple.driver.AppleRTC    2.0
com.apple.driver.AppleHPET    1.8
com.apple.driver.AppleSMBIOS    2.1
com.apple.driver.AppleACPIEC    4.0
com.apple.driver.AppleAPIC    1.7
com.apple.driver.AppleIntelCPUPowerManagementClient    218.0.0
com.apple.nke.applicationfirewall    163
com.apple.security.quarantine    3
com.apple.security.TMSafetyNet    8
com.apple.driver.AppleIntelCPUPowerManagement    218.0.0
com.apple.kext.triggers    1.0
com.apple.iokit.IOSurface    108.2.3
com.apple.driver.DspFuncLib    274.12
com.apple.kext.OSvKernDSPLib    525
com.apple.driver.AppleSMBusController    1.0.14d1
com.apple.iokit.IOSerialFamily    11
com.apple.driver.CoreCaptureResponder    1
com.apple.driver.corecapture    1.0.4
com.apple.iokit.IONDRVSupport    2.4.1
com.apple.iokit.IOAcceleratorFamily2    205.11
com.apple.iokit.IOFireWireIP    2.2.6
com.apple.iokit.IOBluetoothHostControllerUSBTransport    4.4.6f1
com.apple.iokit.IOBluetoothFamily    4.4.6f1
com.apple.driver.AppleHDAController    274.12
com.apple.iokit.IOHDAFamily    274.12
com.apple.iokit.IOAudioFamily    204.4
com.apple.vecLib.kext    1.2.0
com.apple.iokit.IOSlowAdaptiveClockingFamily    1.0.0
com.apple.kext.AMDSupport    1.4.2
com.apple.AppleGraphicsDeviceControl    3.12.8
com.apple.iokit.IOGraphicsFamily    2.4.1
com.apple.driver.IOPlatformPluginLegacy    1.0.0
com.apple.driver.IOPlatformPluginFamily    6.0.0d7
com.apple.driver.AppleSMC    3.1.9
com.apple.driver.CoreStorage    517.50.1
com.apple.driver.AppleUSBHIDMouse    185.3
com.apple.iokit.IOUSBHIDDriver    900.4.1
com.apple.driver.AppleHIDMouse    185.3
com.apple.driver.usb.IOUSBHostHIDDevice    1.0.1
com.apple.iokit.IOFireWireSerialBusProtocolTransport    2.5.1
com.apple.iokit.IOFireWireSBP2    4.2.7
com.apple.driver.usb.AppleUSBHub    1.0.1
com.apple.driver.usb.cdc    5.0.0
com.apple.driver.usb.networking    5.0.0
com.apple.driver.usb.AppleUSBHostCompositeDevice    1.0.1
com.apple.iokit.IOSCSIMultimediaCommandsDevice    3.7.7
com.apple.iokit.IOBDStorageFamily    1.8
com.apple.iokit.IODVDStorageFamily    1.8
com.apple.iokit.IOCDStorageFamily    1.8
com.apple.iokit.IOATAPIProtocolTransport    3.5.0
com.apple.iokit.IOFireWireFamily    4.6.1
com.apple.iokit.IONetworkingFamily    3.2
com.apple.driver.usb.AppleUSBUHCI    1.0.1
com.apple.driver.usb.AppleUSBEHCI    1.0.1
com.apple.iokit.IOAHCIFamily    2.8.1
com.apple.iokit.IOATAFamily    2.5.3
com.apple.driver.AppleEFINVRAM    2.0
com.apple.iokit.IOHIDFamily    2.0.0
com.apple.driver.AppleEFIRuntime    2.0
com.apple.iokit.IOSMBusFamily    1.1
com.apple.security.sandbox    300.0
com.apple.kext.AppleMatch    1.0.0d1
com.apple.driver.AppleKeyStore    2
com.apple.driver.AppleMobileFileIntegrity    1.0.5
com.apple.driver.AppleCredentialManager    1.0
com.apple.driver.DiskImages    417.4
com.apple.iokit.IOReportFamily    31
com.apple.driver.AppleFDEKeyStore    28.30
com.apple.iokit.IOUSBMassStorageClass    4.0.2
com.apple.driver.AppleUSBComposite    900.4.1
com.apple.iokit.IOSCSIBlockCommandsDevice    3.7.7
com.apple.iokit.IOSCSIArchitectureModelFamily    3.7.7
com.apple.iokit.IOStorageFamily    2.1
com.apple.iokit.IOUSBFamily    900.4.1
com.apple.iokit.IOUSBHostFamily    1.0.1
com.apple.driver.AppleUSBHostMergeProperties    1.0.1
com.apple.driver.AppleACPIPlatform    4.0
com.apple.iokit.IOPCIFamily    2.9
com.apple.iokit.IOACPIFamily    1.4
com.apple.kec.Libm    1
com.apple.kec.pthread    1
com.apple.kec.corecrypto    1.0
Model: MacPro3,1, BootROM MP31.006C.B05, 8 processors, Quad-Core Intel Xeon, 3.2 GHz, 10 GB, SMC 1.25f4
Graphics: ATI Radeon HD 5770, ATI Radeon HD 5770, PCIe, 1024 MB
Memory Module: DIMM Riser B/DIMM 1, 2 GB, DDR2 FB-DIMM, 800 MHz, 0x8551, 0x47523244463247425838514D38303051434C
Memory Module: DIMM Riser B/DIMM 2, 2 GB, DDR2 FB-DIMM, 800 MHz, 0x8551, 0x47523244463247425838514D38303051434C
Memory Module: DIMM Riser A/DIMM 1, 2 GB, DDR2 FB-DIMM, 800 MHz, 0x0298, 0x34303030323134342D3032FFFFFFFFFFFFFF
Memory Module: DIMM Riser A/DIMM 2, 2 GB, DDR2 FB-DIMM, 800 MHz, 0x0298, 0x34303030323134342D3032FFFFFFFFFFFFFF
Memory Module: DIMM Riser B/DIMM 3, 1 GB, DDR2 FB-DIMM, 800 MHz, 0x80AD, 0x48594D5035313241373243503844332D5335
Memory Module: DIMM Riser B/DIMM 4, 1 GB, DDR2 FB-DIMM, 800 MHz, 0x80AD, 0x48594D5035313241373243503844332D5335
Bluetooth: Version 4.4.6f1 17910, 3 services, 26 devices, 1 incoming serial ports
Network Service: Ethernet 1, Ethernet, en0
PCI Card: ATI Radeon HD 5770, Display Controller, Slot-1
PCI Card: ATI Radeon HD 5770, ATY,HoolockParent, Slot-1
Serial ATA Device: WDC WD5000AAKS-41YGA0, 500.11 GB
Serial ATA Device: Samsung SSD 850 EVO 250GB, 250.06 GB
Serial ATA Device: WDC WD2003FZEX-00Z4SA0, 2 TB
Parallel ATA Device: PIONEER DVD-RW  DVR-112D
Parallel ATA Device: PIONEER DVD-RW  DVR-112D
USB Device: USB Bus
USB Device: USB Bus
USB Device: Bluetooth HCI
USB Device: USB Bus
USB Device: USB Bus
USB Device: USB 2.0 Bus
USB Device: Hub
USB Device: BlackBerry
USB Device: USB2.0 Hub
USB Device: Apple Optical USB Mouse
USB Device: USB Keyboard + 3P  HUB
USB Device: HP Color LaserJet 2600n
USB Device: My Book 1234
FireWire Device: built-in_hub, Up to 800 Mb/sec
FireWire Device: My Book, WD, Up to 800 Mb/sec
Thunderbolt Bus: