Not wanting to scare you but a guy over the road had a wiemarana (sp) hadn't seen him walking fora while but just thought a nice weather walker anyways i met him last week with an airdale, i asked where the wiemarana was & he said they had lost him 4yrs old
apparently he had a stone in his stomach that they didnt know about & when he went off his food they didnt bother at first then he started being ill took him to the vets & he had got septicemia (sp) they opperated but he died
so its best to go to the vets just to be on the safe side, good luck