A dog will
usually have three distinct lines on the toe
end and the two middle toes will almost
point away from each other. Of course
there are exceptions!
Make sure to quote the part where I threw in the "usually" and the "of course there are exceptions"!
In general, a "large" or coyote size dog will tend to have the spread middle toes. But yes, some domestic dogs do exhibit that feature. The smaller domestics (terriers and such that tend to have the "coyote" print) don't usually make to many tracks in the same area as coyotes before they become prey .