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Hello, this is Dr. Jess. I am sorry to hear about your dog! Can you tell me, do you have 3% hydrogen peroxide at home (the kind used to clean wounds, etc.)? Or can you get some quickly?
Also, do you know the size of the methadone pill in mg?
Unfortunately I am not set up for live phone calls. If you prefer that, I can opt out of your question, or we can continue to live chat here. Just let me know how you wish to proceed.
Is your dog on any other medications?
Looking through some research papers, it does appear that methadone has been studied as a pain reliever in dogs when given as an injection. I cannot find any references right now as an oral medication, but as an injection, a dog the size of your dog (you said 65 pounds?) would be give up to a 20mg dose. So hopefully the amount he ingested is not enough to cause any toxicity, though it could cause drowsiness or nausea. If you want to play it safe, I would recommend inducing vomiting with 3% hydrogen peroxide. You can give up to 45 ml of hydrogen peroxide orally (if he hasn't eaten in a few hours, give a snack first) and then watch him. If no vomiting occurs, then you can repeat this one time, and one time only.
Signs of toxicity would include respiratory depression, CNS depression (being lethargic/non responsive), decreased body temperature, and muscle weakness.
Normal body temperature is 100.5 to 102.5 in a dog. Normal respiratory rate is 10 to 30 breaths per minute.
If you do feel you are seeing these signs develop, then I would take him in to a vet right away. But as I said, based on my drug formulary and research articles, the dose he received would be a normal dose given to a 65 pound dog, so I wouldn't expect severe side effects unless he is for some reason overly sensitive to the drug.
Please let me know if you have any additional questions! If you do not, please take a moment to CLICK AND RATE our conversation so we can know if you were satisfied with your service and I can get credit for helping to answer your questions. Thank you and best of luck to you!!!
I am getting ready to sign off my computer for a bit, but don't want to leave you if you still had a question. Are you still online? Did you have any other questions that I did not answer about your dog?
I am glad to hear that he is doing good!!! I hope he continues to do so. Let me know if you have other questions!
If you can take a moment to click and rate our conversation (you should see in the upper right hand corner of your screen a location where you can rate based on number of stars) so that I can receive credit for helping you today (this is the only way in which I get compensated) I would greatly appreciate it.
Thank you again!