The 7 in 1 vaccine has WAY too many things in it for small yorkie. I probably wouldn't even give it to a larger dog. These vaccines usually have Lepto and Corona in them which can cause serious harm to a small dog. Unless those diseases are prevalent in your area then i wouldn't give them. If they are prevalent, then i would get them as single vaccines weeks apart so if your yorkie does have a reaction to one of them you will be able to figure out which it is.
Personally I would only give a vaccine that covered against distemper and parvo. nothing else. Then, if rabies is needed too, i would get it done 2 weeks later. Only one vaccine per visit for little dogs.
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