My cat is fat

[Monchhichi]

My 6 year old cat went missing for three weeks in June this year, when he returned he was skinny, matted and full of fleas and ticks. He has always been an active outdoor cat, but since his return he just isn't interested in going out anymore, he just snuggles on the sofa asleep all day.

We feed him the same as before he went missing, one pouch of wet food a day plus a scoop of biscuits (he is a large Siberian). I've tried getting some toys to encourage exercise but no luck so far, he merely lazily swipes a paw if they're within reach.

Any suggestions for toys your cats have enjoyed?

Ive put my cat back on her original diet and she's immediately put on weight again. She was on Katkin for a few weeks. I swapped because we are going to be away for a couple of days and it's easier to leave dry food in a feeder. I give her the bare minimum. One pouch in the morning and one small scoop of dry in the evening . I really don't know what to do.