According to the Smithsonian collection of his photographs, he also had an "aligator" (sic) and a chicken with 4 feet. So, seems reasonable that people might hope he had a dinosaur too. Must have been a lot of disappointed customers.

Snakepit Operator, Highway 66, Sayre, Oklahoma https://americanart.si.edu/artwork/snakepit-operator-highway-66-sayre-oklahoma-8363