Have you considered removing dry food from his diet altoghter? Havs you vet confirmed that is is colistus? admididly it does sound as though it is!
DT

Why would changing from a dry food help,I've not heard that before. My bridge baby had colitis all her life the only food she could tolerate was either Burn or Robbies. I gave her the venison one to start with as most dogs won't have had venison so they haven't the problems with it that other meats can cause.

Terri

There dont seem to be any other symptoms he is acting normal and is as happy as ever! i took him to the vet last time as he was overly straining when pooping and there was a little blood in it.

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I would try the yoghurt, I can't see that it would do much harm and could do a lot of good.
I don't know how much to give though

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I work my life around my dog, not my dog around my life

Well hes on a mix of nature diet and JWB turkey and rice at the minute can anyone suggest a change of any, if they think it would help?

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well i gave him one tea spoon on its own and mixed another tea spoon into his dinner, he really likes it so just gonna see how it affects the poo tomoro lol fingers crossed, if not the medicine should be here to moro also

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Its really a strange problem.. never heard bout this before.

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My rescued collie cross had mild to moderate persistent colitis when I first got her at 18 months and I tracked it down to intolerance to wheat, soya and maize - all of which are common ingredients in dog food. It was a matter of experimenting with different foods until I found one that suited her. I used Burns for a while, then found she did better on Skinners hypoallergenic. Another dog I know gets colitis from poultry. The trigger can be anything. Mine has improved with age, she can now eat small amounts of wheat (like snatching a dropped bit of bread off the street) without any noticeable reaction. The yogurt (use goats milk yogurt not cows) could help, and you might also try digestive enzymes before meals. The help the digestive process, breaking the food down better so it doesn't irritate the colon. Some dogs (and people) don't naturally produce the enzymes for themselves. They can't do any harm, as the enzymes should be there anyway. You can get them from health food shops - Quest and Solgar make good ones.

the yogurt seems to be working! he did the biggest firmest poo ever! but then i also found a little runny one so still confused!

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He probably will have a bit of runny at the end of pooing for a day or two

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I work my life around my dog, not my dog around my life