Hey guys - I'm new here!
In January my cat turned 1 years old.

Recently, just in the mornings, he has been having awful diarrhoea... It is somewhat... explosive (sorry!). We haven't changed his food, and he's been going out for a good couple of months now. He has also stopped using his litter tray, he won't even pee in it, so monitoring his toilet habits is really difficult.

He went to the vets a couple of days ago for a booster injection, but the diarrhoea had stopped then (until this morning). The vet basically told us to watch him.

Is there anything else we can do? I really want him to start using his litter tray again so some help with this would be great!
Should we keep him in for a couple of days and see if he gets better?

Yes Sarah, keep him in and also if he isn't already,put him on a light diet of white chicken,fish and see how he goesIt could be a tummy bug or he may be pinching naughty foods whilst out on his travels

Thanks for the advice!
I'm pretty sure Jack will love getting chicken/fish for the next few days

mine had same prob.he picked bug up from oustside..
then after wile it stoped&then came back few weeks later&kept happening.
Then i gave him water instead of milk cos milk gives diarrhoeea too..

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im an animal lover as i have cat and two parrets which they make me laught so there my babies and they call me all time but they no im disabled cos there happy see me.but i single but they scarred,jelous if man talks to me or if man in house lol prob cos not been around men in here but all part of fun.like to talk to other people who has animals
can watch my videos of me&my pets on youtube so click below.can comment on them if u on youtube.
http://uk.youtube.com/ERICAPETS

Jack is so so so lactose intolerant, that he absolutely cannot have even a drop of milk. Sometimes we give him cat milk, which he does like (but I've found he won't eat if he drinks it?!)

I'm hoping it's not someone else giving him milk - I'd be very upset to learn that my neighbours were doing this considering I live in a very cat-ty neighbourhood.

ok so u not givein milk so wont be that well from u shhould say..
could be meat u givein cat as had this prob myself&vet said got try different meats brands to see if makes any difference as said can be meat might be too rich u give so i had try feelix&go cat&kitty cat&tesco cat meat&asda cat meat.so i tryed all them&the tesco meat or asda meat i fiund best cos not as rich as cheaper make&not as rick meat so easyer degest.
so why dont u try different meats?what do u feed cat on now&what have u tryed already in cat meats?

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im an animal lover as i have cat and two parrets which they make me laught so there my babies and they call me all time but they no im disabled cos there happy see me.but i single but they scarred,jelous if man talks to me or if man in house lol prob cos not been around men in here but all part of fun.like to talk to other people who has animals
can watch my videos of me&my pets on youtube so click below.can comment on them if u on youtube.
http://uk.youtube.com/ERICAPETS

Jack has been on a diet of dry food only since we picked him up at 7 weeks.
He has James Wellbeloved (adult) - the vet said this would be really good for him, even if he has an upset stomach.

He hasn't been allowed out this morning, and there has been no diarrhoea - it must be something outside. I've just noticed a cage in a neighbours garden possibly housing birds or rodents (damn fence in the way).... If, somehow, Jack is managing to get their food could this be the cause of his Diaorrhoea?

Could be Sarah,see how he goes on stopping in for a bit-not saying it is due to your neighbors whatever they have but ya never know