My Lhasa Pup used FrontLine Spot-On for the first time last week, he's seems to be fine and normal after using it.  But yesterday, I realised his skin between his shoulder blades was swollen from where I put the FrontLine?  The recent hot weather could have make it swollen aswell?  I checked him today and it's still swollen but not as much and it going down, is this normal?

Why don't you phone the vets John, they would be the best ppl to ask. :)

The Lump is slowly going down, I read in the Frontline packet that it'll do this for maybe a day or two, but not this long.  My pup seems perfectly fine and we are going to the vets next Wednesday to get his last injection and I'll ask then.

I have come across this before with frontline, and have been advised not to use it on my dog.

It's worth asking your vet for an alternative.

I use Stronghold on my cat which is the same and she is fine with it but dogs don't seem to react the same.