Hi Emma, Mature roundworms are easy to see if they are shed in the faeces but tapeworm can be difficult to spot. You might see tape segments that look like a grains of rice at the anus on in the fur near the anus other than that there is no long piece of "spagetti"! Advanced tape infestation can make a dog's coat very dull, ravenous appetite and a general look of unthriftiness with a potty belly (which can have other causes). When I had cats and a flea problem many moons ago I routinely gave my dogs Droncit in the fall, now I don't because touch wood the dogs haven't had fleas for a long time. Tape is not easily spotted on a fecal float, it's one of the environment assessment choices.
When treating for tape you want to make sure you pick up after the dog, then you can have a nasty shock! Rose
