My new puppy has worms!

I took my puppy to the vet for the first time today and found out that he has roundworms! Eeewww! How did he get them and what are they? Is it something I should be really concerned about? The vet gave me some medication to give to him. Will he get them again? He is 12 weeks old.

Asked by Member 558242 on Jan 14th 2008 Tagged worms, roundworms in Health & Wellness
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Your puppy most likely got the roundworms from its mother. Roundworms often form cysts in the muscle tissue of adult dogs. The hormonal changes that occur with pregnancy "wake" these dormant oocysts. From there, they enter the fetuses via the mother's circulatory system. It is also possible that your pup picked up the parasite through its environment (stepped in some infected feces/ate some infected feces, etc.), but >75% of all puppies (and kittens) are born with the parasite. This is why so many vets recommend deworming ALL puppies and kittens.

The only concern you should have is that the parasite is zoonotic (can be transmitted to other species, including humans). However, normal good hygiene practices will reduce the instance of you becoming infected (washing hands after contact with the pup).

Reinfestation can occur any time your dog comes into contact with the parasite (especially feces of other infected animals).

The joys of pet ownership!

answered on Jan 14th.

Other Answers



Worms are really common in dogs, and especially in young puppies. Even during your dog's adult life, you should worm him every so often.

Young puppies usually get worms from their mother. They can get them while they're still growing in her uterus or while they are nursing from her.

Older puppies and adult dogs usually get worms by eating dirt that has worm eggs in it, or eating the feces of another dog that has worms.

You can read more about roundworms here That site has a lot of great information.

Abby answered on 1/14/08. Helpful? Yes/Helpful: No 2 Report this answer


It's unlikely that your dog will be re-infected with roundworms if you pick up the feces and finish the meds. Roundworms are the least of your problems for the future. Hookworms and whipworms are not seen by the naked eye and can cause serious risk in puppies especially. If you start your dog on heartworm prevention such as Heartgard Plus or Interceptor, then you will automatically be worry-free of intestinal worms. If you don't plan to protect your dog from life-threatening heartworms with a monthly prevention, then worm him once a month with pyrantel pamoate. This will free your dog of rounds and hooks but not whips. Also, the more you pick up the poo in your yard, the better off you will be. Plus, your dog can also pick up worms at parks and other yards. Prevention is better than treatment so I'd keep up with the wormer on a monthly basis to be sure. You'll see the rounds come out in the stool like spagetti. Don't let your pup eat them and you should be good to go! Good luck!

Member 558243 answered on 1/14/08. Helpful? Yes/Helpful: No 2 Report this answer


You have some excellent answers, here. The only comment I have in addition to what's been said is about the medication, itself.

The medication used to de-worm dogs and puppies can be harsh on puppy tummies and some dogs have a really bad time while they are on this medication. Vomiting and diarrhea can occur as a side effect of the medication. Of course, that is also a symptom of the worms, too...

Other dogs don't even seem to have any side effects from the meds at all.

Just something be aware of while you're treating him.

Jack answered on 1/14/08. Helpful? Yes/Helpful: No 4 Report this answer