what excatly are the syptoms thanks,due to raw foods that give him,or is it completely different subjext,thanks

The presence of worms will not necessarily mean that any specific symptoms are present unless the burden is huge. 

Raw food per se will not make your dog more or less likely to have worms as meat commercially produced in the UK for domestic consumption is regularly treated with a wormer to avoid various health issues.

However wild game eg bunnies may be a problem to some dogs.

If you want to know if your dog has them, you can always have a worm count done at the vet, which will tell you if any are there; if there are none you can avoid worming until and unless they appear.......

hi Robin

I worm preventatively every 3 months with Drontal + and once a year I worm with Panacur, just to use a different wormer.  I don't wait to see worms in the poo, because by the time that happens your dog has a heavy worm burden and has had them for some time. 

The wormer will kill all worms of certain types in the dog's body at the time you worm it.  But the day after the dog has been wormed, he could go out and eat, say some cow poo, and then pick up worms again.  So worming does not stop the dog getting reinfected, it just kills the ones which are already there.

I assume that my dogs probably will pick up worms in the 3 months between wormings, but I know that the worms will all be killed before they affect their health if I worm every 3 months. 

It's also worth saying that worms can be spread by fleas, since fleas carry tapeworm eggs.

thankyou very much,can worms affect the fur or skin for that matter,besides the poo,dont they get a real itching sensation,thanks
also if i decide to worm him early (in between the 3 month margin) will that interfere with the way worms work,and if i decide to worm him early should i begin a new 3 month margin,staring from that soecific date,thanks,

I've never heard of worms directly affecting fur or skin, but I do think that a dog with worms will not be in top condition, and that itself is likely to be reflected in poor coat or poor skin condition.

It's fine to worm early, in between the 3 month margin.

If you believe your dog has worms (because you've seen them or have other evidence) then I would worm, then repeat about 5 days later with another dose.  Then worm 3 months from last date.

If you're not sure your dog has worms but you're just worming because it's due or because you want to rule it out as a problem, then just worming once should be fine.  Then 3 months later.

The 3 month thing isn't set in concrete.  The main thing is that there is no persistent effect of the wormer-I mean that if you worm today it won't stop your dog picking up worms tomorrow.  It just kills all worms that are there at the moment.

thankyou very much