A commit to UCLA since April, Dowling decided on Thursday evening to open up his recruitment.
"Sean is going to still consider UCLA, but he's opening up his recruitment at this time," said his trainer, Troy Lau.
"He's considering Cal, Oklahoma, Vanderbilt, San Diego State and UCLA," said Lau.
According to Lau, he will take one more visit, though the destination for that is unknown.
Dowling was one of eight offensive linemen committed to the Bruins, but his decommitment trims that list to seven.
The three-star has been selected to the Semper Fidelis All-American Bowl.