I have a chihuahua. I googled can a dog throw up from using first shield and found this. First of all, I am glad to know I am not the only one. I called Banfield and they said they have never heard of vomiting from it. I don't want to take him in, and pay lots of money. This isn't the first time though. This is his first time using first shield. But previously, he was using vectra. They said that first shield is a branch from vectra. My dog threw up every single time I gave him vectra too. I thought it was because he was consuming it though. I didn't know how to put it on. I was putting it too low, and I would catch him turning his head around to lick it off. This time I put first shield on his head, behind his ears and around his collar. There is no way he was able to lick it, and he is still throwing up from it. It has to be some sort of side effect. I don't know of anything else to try. What else could I use on him? I want something that protects from fleas and ticks. He is also shaking a lot. It seems like he is trying to shake his head until it comes off or something. Someone please tell me what to do. He kept me up all night throwing up.
