A large dog with his build and his markings, I would say that there is a very good possibility that he has pointer in him along with possibly another sporting
breed or even a hound
breed, although the ears are not hound-y, they are more like a lab's ears. Pointers have long ear pinnae, not the type of ear that Milo had, however pointers have the colored head and white body. They also have the ticking that Milo appears to have had in the pictures.