Interceptor Question??
My vet said to start my puppy on Interceptor and to do it once a month for the rest of her life. I called the pet store where we got her just to be sure that they didn't give it to her yet, since we've only had her for 2 weeks. The pet store said that we need to have a heart worm check before giving it to her…is that true? I'm waiting to give it to her and will call the vet tomorrow, but I'm just wondering what others have heard.
In response to the "vet tech." : My question states that I am going to speak with my vet and I would have today, but it is Sunday. Besides all of that….you said "It doesn't matter how long you ve had her.
What matters is how old she is.
If she is over 8 weeks it is safe to administer."….well, I think it DOES matter how long I've had her since if the pet store did give it to her 3 weeks ago, I don't want to give it to her today. Since it is a once a month thing. That is why I called the pet store to see if they had given it to her…the vet would not know that…make sense now??? 
The best answer is by :
grinninh :
Why are you referring to a pet store rather than your vet?
Your vet and its staff have a veterinary education and years of experience behind them.
Your vet is following the best current recommendations for quality health care.
Interceptor is safe for puppies over 8 weeks old and should be started as soon as they are 8 weeks.
It take 6 months for a heart worm to develop and demonstrate a positive result on a heart worm test.
That is why no test is needed and the sooner protection is provided the safer the pet is.
It doesn't matter how long you ve had her.
What matters is how old she is.
If she is over 8 weeks it is safe to administer.