Dog seems to be constipated

well it turns out my dog has a problem with her colon holding on to her poo to long for some reason anyone else dog had this problem

Hi Colin not that I am aware of.
What do you feed and what does the vet say.

Just said her bowels was full of poo can't really remember head was in a spin she's back on Friday

I don't suppose the conditions will be identical, but my boy has had problems with an ulcerated colon for almost 3 years now. I would ask your vet about doing some test feeding to find out what type of food is likely to suit him best. (Allowing a few weeks on each for a fair trial). Although wheat is the most common allergen, my lad appeared to react most to maize as an ingredient, and has ended up on Wainwrights grain free kibble. I add a good variety of (usually cooked) chopped vegetables, and a little of either Butchers Tripe, Naturo tray food, or minced beef as a garnish. I also give a probiotic and a fish oil capsule.
He is rarely constipated these days, but if it is needed I give him 5mls of Lactulose in a little milk, (he weighs 17 kilos).

Been back to see the vet her colon isn't working properly that's why she is full of poo she's on psyllium husk and Zantac back in 4 weeks for a Xray was thinking about giving her some all bran as well

Psyllium should help. Hope she's OK soon.

I wouldn't give her all bran, if it's the human cereal you're talking about - it actually has a high amount of sugar in it which won't help. Better to give her fresh food that has plenty of soluble fibre in. Maybe see what the medicine does first though, then ask the vet what fibre foods you could supplement with.

You may notice your constipated dog appears bloated. He may be in some pain as well, especially during the act of trying unsuccessfully to poop. If he’s able to pass stool, it may have an odd color – usually darker than normal. You may notice mucus or blood or other oddities you’ve never noticed before.