Unless dogs only have telepathy for knowing where not to pee in the house I don't know why anyone would assume they had it at all. Anyway, check this out from weirdexperiments.com:
Just found this picture from around 1920. In this telepathy experiment between human and dog Karl Krall (on the right) tried to detect the thinking radiation he assumed to flow between the two. Krall was a rich dealer in diamonds who had founded his very own institute for paraphysical research in Munich. He had also taken care of the famous horse Clever Hans (who performed arithmetic in Berlin in 1904) after his owner Wilhelm van Osten had died. He thought Hans used telepathy and started an elaborate research program but he was wrong: the horse could read the right answers in small unintentional signals given by humans.
This is reminiscent of the scientific golden age, before the wide acceptance of Relativity theory, when scientists were willing to explore all sorts of wide vistas, including ESP, including dogs.
I think it is wise not to make fun - for what wide vistas may we miss, now that we narrow our scope to tiny things?
Cheers and thanks for the interest post and best wishes for the holiday season,
However I should say, because I did not make this clear, I am definitely not believing in the telepathy of dogs!