I am not a Yorkie owner, however I want to express my opinion about Vectra3d Flea control product.
I had a 13 year old Mini Dachshund. Good health, no major problems. It may have been coincidence but we got this product from our Vet who recommended it after they told us they were no longer carrying Advantage, which is what we had used many times before on our dog.
Well, long story short. 3 days after using this product our dog passed away. Pretty horrible experience, maybe not the fault of this product, but it was very coincidental to say the least. One day she was fine, the next she was panting and breathing fast and hard. Took her to a new Vet who said he never heard of Vectra, but "doubted" it was a contributing factor as to her heavy breathing. He "thought" it looked and sounded more like a collapsed trachea. He gave her what a steroid shot, gave me some pills and told me not to start the p-ills unless her condition improved by 8:30 am the next morning and then call him. Well, the next morning at 4 am, she passed away.
End of story and I will never use this product again, regardless.
Rest in peace Sabrina, we will miss you!