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Numerous reports were made to police about a dog chasing a lamb on the motorway about the same time as a three-car crash.
A police spokeswoman said police were unsure if the crash was caused by the wayward animals.
The lamb's owner, Kath Morris, said despite a extensive search of the area the lamb has not been found.
"I've been in touch with the SPCA and they're aware of it and Animal Control but they haven't heard anything about her."
Since the lamb went missing its mother has been bleating constantly with her other lamb by her side.
Mrs Morris said the mother left the area where the missing lamb was being chased to save her other lamb.
Anyone with any information about the lamb could get in touch with the SPCA or Mrs Morris.
Emergency services were called to the crash about 100m north of the Old Brighton Rd over-bridge in the city-bound lane of State Highway One at 8.45am.
A police spokeswoman said the two vehicles were only partially blocking the road and traffic was still able to move past the site.
There appeared to be no serious injuries, she said.