You might want to call the vet and see if you need to redose. I know the Comfortis box says if they vomit within 30 minutes, they have to be dosed again. I don't know about Trifexis though.
Also, I thought they had to at least weigh 5 pounds. Because my vet weighed my Chi at least 4-5 times trying to make sure she exceeded 5 lbs (she does by about 4 ounces) when we were trying to get the Comfrotis. |