Viva, that's a good thing, if they are the same as ponies If there are dead worms in the poo then the worms are coming out of the dogs system.
The farm where our pony is kept send off poo samples. Ponies can become immune to the wormers on the market and one of their ponies recent had a bad case of worms, so clearly had become immune. She was wormed, and her poo's were manky for about a week afterwards, lots of dead worms in them (you have to 'poo pick' the field, this is how I know!)
Cue waiting in the yard for approx. 10 ponies to poo (obviously they didn't), so we can put our respective ponies poo in the little sample box to be sent off for analysis. Obviously they didn't so then lots of loading on and off trailers (usually they poo when loaded) or following them round in the field for ages and ages.
Egg counts back and most medium or high, even though up to date with their worming treatments so they have all been wormed with a herbal wormer and samples sent off again for analysis after a given period. Luckily, our pony now has zero eggs showing in his poo sample so the herbal stuff has worked
I found a company that you can post a sample of your dogs poo to and they look at it under a microscope and email you to say if your dog has worms.
I think it'll be interesting to see what they say. I've wormed the dog regular with Drontol so thought he was fine. Then used some advocate for fleas and a week later there were some roundworms in his poo. This was the other day so I'm a bit freaked out. The vet said that the worms must be dead if they're coming out, I'm not sure though. When he first pooed there were no worms, ten mins later I could see worms so they must have been moving.
The company sent a little kit out. With a tiny box to put the poo in. It was all a bit gross. I had gloves on but managed to get poo on the outside of the box so I feel sorry for the person who opens the envelope. Though hopefully they have gloves on as well.