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The earliest picture of the dog leash dated back to 4400 BC. Frisch, Karen. "The History of Dog Leashes." EHow. Leaf Group, 20 Aug. 2009. Web. 04 May 2017.
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I don´t know why the leashes were made of leather. I assume it was to show power and money.
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Dogs would wear metal collars to show aggression.
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Robert Goulding Jr. invented the flea collar. "Robert Goulding Jr., Flea-Collar Inventor." Obituaries | Robert Goulding Jr., Flea-Collar Inventor | Seattle Times Newspaper. N.p., n.d. Web. 09 May 2017.
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Manfred Bogdahn Invented the retractable dog leash.