I've only used the tablets, but when I used them, each tablet was only for 2kg, so the choice was either 2.5 tablets for my 5ish kg cat, or half a dog one, I've not used it on a cat since so don't know if that has improved, he had a reaction to spot ons, so we had to use an alternative, I personally prefer spot ons to the tablets.

I recently got 2 cats from Cat's Protection to replace mine that died (at different times) a while back.
Both are female, a bonded pair, 3.5 years old, named Panda (black and white) and Nancy (tabby)

I was advised before they came that Panda had the habit of pooing outside the litter box. For about 2 weeks she didn't do that, but she has started it now and always in the same place, behind the front door on the door mat
I have tried putting a covered then an uncovered litter tray there and a then very shallow plant tray with litter in it, in that spot, but she did it next to it on the mat.
She is using the litter trays to pee in. ( I have 4 in total throughout my flat)
To enable me to clean it up easily I moved the doormat and replaced it with a plastic carpet runner so I can scoop it up easily. She hasn't done it on the doormat since, she is doing it on the plastic runner, so it would seem that it's the locaton that matters to her and not the door mat.

I should add that in every other way they are both very happy and contented and affectionate so I don't think it's an insecurity problem

Does anyone have any suggestions as to how I might solve this problem ?

Only just seen this Francis and so sorry to read the news.

He had such a wonderful home with you and I know he will leave a gap.

James always seemed such a laid back boy and it is wonderful how much the acupuncture helped him in later life.

Thinking of you all

It has made such a big difference to Archie who is 17. He has arthritis and wobbly back legs.

It is obvious when he needs his next injection and thankfully the insurance are paying.

Thank you! Kittens are booked in for Tuesday and their notes from the rescues vets should be winging their way over to my vets, Unfortunately one of the kittens has developed a "gammy" eye, This doesn't bode well but at least I will be able to have a frank chat with the vet on Tuesday and work out what to do for the best.