Advantage - using smaller size for cat over 4kg?

[Susanne (urbantigers)]

I'm assuming it will still work, even if the dose isn't quite enough to get rid of fleas.  But it's just preventative and he's an indoor cat.  I just like to do him when the weather gets warmer then again late summer as a preventative thing.  But having said that, Mosi is due at the vets for his vaccinations in the next week or 2 so I'm going to hold off getting it until then.  I  might find out that Mosi is over 4kg as he's not been weighed for a while.  Or he might be close enough to 4kg for it to be safe to use the one for over 4kg on them both.  I will ask the vet's advice but I'm a bit wary as I'm sure they'll advise me to get both sizes and therefore buy 8 vials of the stuff instead of 4!

[Ela]

I would agree with Bazsmum as it is just preventitive.

[Bazsmum]

If its just for preventative then I cant see the harm in it! 

[tigerbaby]

We use Advantage on Jameson too - I would say you'd be ok to use that one for Jaffa if it's a one off thing- he is an indoor cat isn't he? Although in the future I think you should buy the correct one for him.

[Gill (sneakiefeline)]

You really should use the one that is correct for his size cos it wont work prperly otherwise.

[Susanne (urbantigers)]

Jaffa weighs 4.8 kg - can I get away with using the Advantage treatment for cats under 4kg?  Or do I really need to use the one for cats over 4kg?  They come in packs of 4 and I don't like having to buy 4 of the under 4kg for Mosi and 4 of the other ones for Jaffa at the same time.  He doesn't have fleas - it's just as a preventative.