I started giving Program tablets to my dog late summer / early fall last year.  I had been using Capstar (which works miraculously but is too expensive to use daily as a stand alone) and read many reviews and articles stating how great Capstar and Program are when used together.

My dog has allergies (nasal and sometimes skin).  Her hair started thinning out a little in the back and I just figured it had to do with her skin allergies.  It very slowly kept getting worse.  I have been trying over and over to figure out if there was something that could have been causing this, I realized it started after giving the Program tablets.  I skpped the past month's tablet and hopefully her hair will grow back in.  Can't decide on a monthly to use on her, because Frontline Plus gives her hives on her belly.  I will continue to use Capstar as needed (a couple times a week or whenever she plays with the neighbor's dog or grass is long/wet and itching starts).

I'm not saying it is a problem for all dogs, but it did cause the hair loss on my dog.  This may not be a common side effect, but I can't recommend it to others because of this.
I started giving Program tablets to my dog late summer / early fall last year. I had been using Capstar (which works miraculously but is too expensive to use daily as a stand alone) and read many reviews and articles stating how great Capstar and Program are when used together. My dog has allergies (nasal and sometimes skin). Her hair started thinning out a little in the back and I just figured it had to do with her skin allergies. It very slowly kept getting worse. I have been trying over and over to figure out if there was something that could have been causing this, I realized it started after giving the Program tablets. I skpped the past month's tablet and hopefully her hair will grow back in. Can't decide on a monthly to use on her, because Frontline Plus gives her hives on her belly. I will continue to use Capstar as needed (a couple times a week or whenever she plays with the neighbor's dog or grass is long/wet and itching starts). I'm not saying it is a problem for all dogs, but it did cause the hair loss on my dog. This may not be a common side effect, but I can't recommend it to others because of this.