I have an emergency number for Eli Lilly who manufactures Cymbalta. They would be best to tell you if there will be any long term toxic effects. I believe the span of action is about 8 hours. I am going to give you the Emergency Number since they can confirm if your boy is over the worst of it. Joan
1-317-276-2000. They should be able to offer some info on toxicity w/o a poison control charge.
To my understanding the dog has already been through the wosrt part of this.The life is about 8-12 hours. This may cause some gastrointestinal upset. I really believe at this point it will just have to wear off. I would feed some startchy foods to help absorb some of the residual medication that is left in the gut. The remainder should be passed through the stool. Some of the SSRI's are given to dogs. I worked on a dog that ate a Lamictal with no adverse affects. If he had it between the hours you mentioned, the worst should be over and he should be back to his perky self. I would follow up with the Vet. in the AM to make sure Max is ok. Joan