Traffic officers are now heading to the scene, between the M62 and the A1034, Highways England said at 8.45am today (Thursday).
There are currently long delays on the stretch of the A63 near Hull because of the "loose dog" on the road.
Long delays on Yorkshire's A63 as 'dog is loose' on carriageway
Severe delays are building on the A63 in Yorkshire after a dog found its way onto the carriageway.