ok thanks, ***** ***** likely the cause of his back end being dirty.
soft stools or diarrhoea can often cause this. it can be due to diet, he may have eaten something that ahs upset the stomach causing soft stools.
products to help with this can be bought online or from your local pet shop or vets such as - pro-kolin , pro-max or fortiflora. they help replenish the healthy bacteria in the gut and bind up soft stools to help resolve this.
as he isnt wormed, i would advise him getting weighed at your local vets so they can prescribe worming as parasties in the intestines can also cause this - products form the vets are much more reliable and safe than medications form the pet shop or supermarket.
if the soft stools clears up then this is great, if it doesnt the next step would likely be faecal sample analysis which you vet can organise
if the stools turns to diarrhoea over the weekend or if tom becomes lethargic or starts vomiting then i would advise seeing the emergency vet today
i hope this information helps