After some 3k shots of the muts running around and some advice from a pro sports Fuji shooter friend, this is what works for me shooting the dogs running full speed.
Autofocus Continuous
Shutter priority 500th or 1000th
Auto ISO 6400
AF Mode - All
AF-C custom setting
Tracking sensitivity 4
Speed tracking 0
Zone area front
Pre AF OFF
Subject detection Animal
AF-C priority Focus
Button dial setting
Shutter AF-C OFF
With these settings AF On does the focusing and shutter button only takes the shot. This works with great results .
I will post some photos when I get home.
X-T5 XF70-300mmF4-5.6 R LM OIS WR lens 178mm f/5.0 1/1000s 800 ISO 0.0 EV
X-T5 XF70-300mmF4-5.6 R LM OIS WR lens 178mm f/5.0 1/1000s 800 ISO 0.0 EV
X-T5 XF70-300mmF4-5.6 R LM OIS WR lens 178mm f/5.0 1/1000s 800 ISO 0.0 EV
X-T5 XF70-300mmF4-5.6 R LM OIS WR lens 178mm f/5.0 1/1000s 800 ISO 0.0 EV
X-T5 XF70-300mmF4-5.6 R LM OIS WR lens 178mm f/5.0 1/1000s 800 ISO 0.0 EV
X-T5 XF70-300mmF4-5.6 R LM OIS WR lens 178mm f/5.0 1/1000s 800 ISO 0.0 EV
X-T5 XF70-300mmF4-5.6 R LM OIS WR lens 178mm f/5.0 1/1000s 800 ISO 0.0 EV
X-T5 XF70-300mmF4-5.6 R LM OIS WR lens 178mm f/5.0 1/1000s 800 ISO 0.0 EV
X-T5 XF70-300mmF4-5.6 R LM OIS WR lens 178mm f/5.0 1/1000s 800 ISO 0.0 EV
X-T5 XF70-300mmF4-5.6 R LM OIS WR lens 178mm f/5.0 1/1000s 800 ISO 0.0 EV