Cat vaccine given to dog

Hey, By mistake my vet has given a cat vaccine (nobivac tricat trio) to a 2 months old puppy. Is it harmful or is there any threat to the kid ?... Also if yes, what can be done to treat it ?

Hello - I am not aware of any likely adverse reactions - as with any drug, there is always the chance of allergy.  Obviously I don't know the exact circumstances / drug / how it was given.  I do know that most of the viruses that affect one species wouldn't affect the other.  The correct thing to do in this situation is for the vet to record what happened in the notes and double-check with the data sheet or vaccine company as to what further action is needed.  A repeat vaccination will be necessary if nothing else.