A puli is known for its long coat that looks like dreadlocks, or cords, according to the American Kennel Club.
The possum, which is different than the opossum found in America, was clinging to the dog's long locks.
Both of Watkinson's dogs were calm around the frightened baby, The Dodo reported.
Watkinson eventually walked to a nearby vet, with the possum holding onto the dog the entire ride, to have the possum checked out, according to The Dodo.
Once given the all-clear, the possum was given to a wildlife carer so it can grow before being released back into the wild if the real mother can't be found.
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