Hi, we have two cats and noticed one has worms. We have en-dex 8000 for our dog which says it can be used on cats but our cats are under 6months old still . The one with worms is less then 2kg. 

 

Can anyone recomend anything I can buy online?

Go see your vet for anti worm meds. Dosage depends on weight. It is very cheap. Dose needs to be repeated one week later to catch immature parasites. If one cat has worms then I would not be surprised if the other has. Jeez... the things I know that I thought would never be useful!