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Hello, I'm Dr. Kara. I have over 20 years of experience as a veterinarian and I'd like to help. Please give me a moment to review your concerns.
How long ago did this occur?
If it has been less than 2 hours it is best to induce vomiting.
At 11 pounds he should be given 1 tablespoon of peroxide with bread chunks or a small amount of ice cream to induce vomiting.
Then take him outside and run him around to agitate the peroxide so if fizzes and causes irritation to cause him to vomit.
If no vomiting in 15 minutes repeat the dose one more time
Make sure the peroxide is fresh, if it doesn't fizz it will NOT work.
Invokana (Canagliflozin) is an oral antihyperglycemic agent used for the treatment of type 2 diabetes mellitus that blocks the reabsorption of glucose in the kidney. As such it allows the kidneys to release excess blood glucose.
It does not interfere with the effects of natural insulin in the body and as such I would not expect your fellow to get hypoglycemic (low blood sugar) and as such I would not expect him to show signs of hypoglycemia (low blood sugar) such as weakness, incoordination, severe lethargy.
But this drug is not used routinely in dogs, and as such we don't have any literature on truly appropriate nor toxic doses for them.
As such the best way to avoid any trouble would be to induce vomiting and get rid of the drug.
If he doesn't vomit then close observation for signs of low blood sugar is best. If he is weak, uncoordinated, vomiting, or very lethargic then he should be examined at an emergency clinic and admitted for treatment.
Please let me know if you have any further questions.