Decent sized doggie. Trotting most likely judging by the pad depth and claw marks...pad lands hard and then rolls forward and claws dig in on push off. Arena sand skews tracks a bit, we tend to use roundish sand grains as footing and they roll easily away from pressure. One regular sand or dirt tracks aren't as deep or as large.
Although it's a narrow canine paw...anyone around have a dobie or greyhound? Something similar in size? Trying to think of breeds with narrow-ish paws.
You jump in the saddle,
Hold onto the bridle!
Jump in the line!
Yep, that is why I was not quite sure what it was...huge prints
There is a huge mutt type dog that lives nearby, but again I've never seen him on our property. Yesterday morning I did see him (or I though it was him) in the woods in the far distance. He is so big it was hard to tell if it was a dog or deer.
Looks like a breed of dog (or cross) with flat webbed feet,(the top of the print is round not pointed, and you can see marks of webbing between toes). Feet are some what hairy ( the ground below the heal-pad is pushed down, probably by long leg feathers getting stepped on). The toe nails are over grown. Coyotes and wolves wear their nails down with all the miles they travel. IMO If horses are worried about it, believe the horses. I would catch it or shoot it ASAP.