Agree with Griff check his anal glands if you can.

Hi, this a.m. I took him out and noticed a worm in his stool...again!! He's had worms probably 4 times now in a total time period of 6 months! This last time I treated him myself and hadn't seen any for a couple of months at least...then came this morning

It just seems so strange that they just keep coming back. But then again, they haven't always been the same type of worm. This one was alive and moving-don't know if it's better that they're dead or not? I'm wondering if one of my cats has worms, because he tends to like to eat their stool if it's outside the litter box, and because he's getting them so much, I start to think maybe that's how he's contracting them so much. He also loves to eat ANYTHING outside. However, I've never seen worms in the cats' stools, but I also don't look that hard when it's in the litter box.

Has any one had so many reoccurrences of worms? I know he's a puppy and they're common, so maybe it's no big deal. Also wondering if maybe that could be a cause of his itching?? I plan to take him to the vet again this time because it's obviously not going away...

I would suggest you worm the cats and the dog with the appropriate wormer for each animal, you should ensure that you use a vet approved one as the ones you can buy in pet shops aren't that great. There are products that you can get that are spot ons that do fleas mites and certain types of worms....i would be off to the vet and telling them the worms are recurrent and see what they can suggest

I just assumed the cats couldn't get worms. They DO NOT go outside, though they've escaped a few times...But maybe from fleas?

It sounds as if you have been clearing the adult worms with your dosing, but after these have already laid their eggs in his gut, which are then hatching and causing the reinfestation. Yes, worms can cause irritation in the lower bowel and anus.
I think you need to get all of your pets worm free, and make provision for treating any juvenile worms, before they have time to lay their eggs. The vet should be able to advise on the method and schedule for worming your dog and the cats at the same time.
I suspect that the other type of worm he has had would have been tapeworm, (the segments of which look like little rice grains), which would probably have been contracted when he had fleas, as the flea is able to transmit tapeworm.

The re-infestation idea would make complete sense. I guess that just means you have to treat longer then to completely rid of the unhatched ones.

Maybe 1 of the times I thought he had whipworm, he actually had tapeworm, because yea they did look like little grains of rice. And we have 5 animals, and have had very bad cases of fleas, so I wouldn't be surprised at all about that.

Is that what heartworm (worm) preventative is for? I know it doesn't treat, but I guess it would prevent any unhatched worms from hatching??? I do need to get him on that, but have to have the test done first before they'll supply me with it.

Maybe one of our US members will be able to advise whether heartworm prevention has other benefits, as this is, thankfully, a species that we don't have in the UK.

There are charts on the internet (http://www.anydogrescue.org/benadryl-for-dogs/) that give you the appropriate dosage for various dog weights. I always have benadryl on hand during the summer because of my yorkies get itchy, and allergies.