Hello and Thank You for contacting JustAnswer
When did he eat this
How did you try to induce vomiting
Two hours ago
Dog product from petco.
Because of the length of time inducing vomiting at this pint may be ineffective.
The normal dose of morphine for a dog this size would be 3-7.2 mg so this is almost 10xs the dose.
A dose this high can lead to depressed breathing, seizures,coma and death.
Read more here
I would suggest taking him to your local animal emergency immediately, they can administer activated charcoal to stop further absorption and provide supportive care as needed
I hope he is ok, please reply back if you have additional questions