During our walk  this morning when clearing up after my boy I noted fresh blood running through his poo! Never seen this before and running round as normal.  He is up to date with worming tablets and jabs. We have just returned from Yorkshire where he enjoyed lots of fields,muddy farm puddles etc. Shall I just monitor or worry?

Fresh,bright red blood I wouldn't worry. Dark,tarry looking blood is a worry.

He has most likely eaten/drunk something yuk, may lead to upset tum in which case it would be the usual 24 hour starve,probiotics and bland diet.

Thank you!I did a Google search too and apart from Parvo (his up to date) parasites (worming up to date) colitis  (?) Or foreign body/dodgy human food cause fresh blood in stools. Tarry I know same as humans dodgy and hidden signs elsewhere  for bleeding.
Currently his bouncing round in the sunshine watching OH prune plants. I'll keep checking his poo thou.

During our walk  this morning when clearing up after my boy I noted fresh blood running through his poo! Never seen this before and running round as normal.

You need to get him to an emergency vet ASP, blood in stools is an indicator of Hemorrhagic gastroenteritis, which if not dealt with straight away will be fatal, a vet might rule it out or might not, there are no taking chances or 'if's but's & maybe's - it can only be eliminated by a vet!!!
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I have 12 dogs and if I took one of my dogs to the vet every time they had a bit of bright blood in a stool I would alone pay the vets pension.

It is very common, in people it is a cause for concern whatever the colour but in dogs it just needs common sense and monitoring. If you take a dog to the vet and tell them it's passed some bright red blood they will pack you off with antibiotics and a very expensive prescription diet!

Honestly,don't panic,use common sense and if the blood gets more and more and the dog gets lethargic then off to the vets.... If not just rest the gut before reintroducing bland food and probiotics..... Has always worked for me for the last 30 years:)

I have 12 dogs and if I took one of my dogs to the vet every time they had a bit of bright blood in a stool I would alone pay the vets pension.

Ignore her saxonjus, don't risk your dogs life - end of!
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I had this with my older girl last week, I was alarmed, but not panicked.
It was cholitis, She had a bit of a temp and was a little off colour.
She was needing anti biotics and a pro biotic too. So agree  with Bucksmum....

I have 22 dogs and would always err on the side of caution.  I would rather the vet tell me that I only need Protexin (which he knows I keep at home) I know how rapidly a bitch of mine went downhill after an episode.  She was so ill that she had to be hospitalised and put on a drip.

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Please give us an update By saxonjus.
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Since that morning I've been on poo alert! Not easy out in the fields. Not seen any sign of blood since. No hardness feeling tummy,eating and drinking well. If I do spot any again I'll go to vets.

That sounds good saxonjus, if it had been Hemorrhagic gastroeneritis the dog would not have lasted this long without veterinary intervention, much of the terminal damage is done not by excessive bleeding (each case is its own measure) but by acute dehydration, vets give out rehydration solution as an essential part of treatment, another to bear in mind is that the dogs in themselves can still be active & show no other signs anything is wrong until its to late, never rely on the activity levels as an indicator if the activity levels seem normal.

Another thing I want to add, in view of some posts on here is, some people give the impression blood in stools is 'quite normal' > it is not normal and can be terminal in a very short time, measured in hours not days depending on how soon the owner notices something, which not an immediate onset!
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I was on alert re being dehydrated,being lethargic checking abdomen (999 training came in handy) Dark tarry stools I'd have shot off quickly to vets and if a further blood few poos I'd have done the same.
Same as in humans if blood in your poo for a while check it out.. I know a 29 year old friend advised its IBS and told piles for blood stools when after an examination was bowel and liver cancer :(

I would never ever say it was normal to have blood show in a stool!!
In fact If it happened to any one of us we would hardly think it normal, let alone our dogs.
But a little caution, experience and common sense in all things, just helps to reassure or otherwise.