[Contance]

Please ! I need help,
I gave my small 4# yorkie trifexis last month and that made her really sick so, told the vet my concerns for her so, he gave me bravecto , I haven't given it to her yet. Decided to read a bit about it and everyone says bad things so, now I don't know what to do. If you have a small size yorkie what do you all use .. so worried. She is so healthy and I don't want to give hersomethingthat is goingto make her sick or worse give her something that is going to kill
her please need some advice