Actually, I would ask the vet about a heartworm test and preventative medication, if the dog isn't already on it. One of the available preventatives, Heartgard Plus, also deworms for roundworms and hookworms. Interceptor covers those plus whipworms. (I like this best because we have lots of whipworm problems here.) Both of these are given once a month.
The other common worm that these do not take care of is tapeworms. Tapeworms have to go through some sort of intermediate host like the dog eating infected raw meat, rodents, or swallowing an infected flea. They don't transmit directly dog-to-dog. Most vets recommend deworming for tapes with a prescription medication if you actually see them in the stool. Intact tapeworms are long & flat, like fettucine, or they break up into short segments that look like flakes of coconut. Once the segments dry, they resemble grains of rice, and you often see them stuck around the anus & under the tail. (~really sorry that I describe all of them in terms of food~)
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