How do I determine my guinea pig's gender? Is it a boy or girl?

Thanks for using Petco Pet Education Center, formerly Petcoach! At least on these pictures, they both look like males. Keep in mind that it is not that easy to determine this based on a picture. This will be easier to determine when they get a bit older as well. Have a great day!

Thanks for your question about your guinea pigs, and congratulations on getting new members to your family. The photos are mildly blurry, but both of the pigs look like females. One thing you can do to confirm - the lighter colored guinea pig photo is more clear and is a female. The darker one is a bit harder to tell - if you compare them and they look the same then they are both females. If you are unsure, you can also post additional photos. I would recommend taking your new pets to the veterinarian for a wellness exam. They can provide you with husbandry and diet advice so that your new friends can stay happy and healthy. Thanks for using Petco Pet Education Center, formerly Petcoach!

It is hard to tell from the photo but the swelling may just be his testicles they can retract them, so sometimes you won't see them. If there are 2 swellings then it will be tested, if not or you are unsure best to have it checked at the vets.

I am sorry to hear about your guinea pig. A photograph may help us better evaluate the area. If you are certain the area looks swollen (meaning you have viewed the area previously and it now appears altered) I would recommend a visit to the vet for your guinea pig. If you aren’t positive the gender of your guinea pig it’s possible this is a male starting to sexually mature. You can read about determining gender at http://www.guinealynx.info/sexing.html

We can certainly try. Post again with your question, just know that we legally cannot provide a diagnosis or medication in the absence of a physical exam and a VPCR (veterinarian-patient-client relationship). You may need to find a veterinarian to examine Buddy. Most veterinarians will examine small pets. If a specialist is needed, they can refer you to one or seek a consultation with a specialist. The larger veterinary reference labs have specialists on staff for consultations by practicing veterinarians.

#1 & #2 look like females. I suspect #3 is female as well, but the area that needs to be seen is tipped downward. You can follow the link below then check #3 and recheck the other 2 for confirmation. http://www.pet-informed-veterinary-advice-online.com/sexing-guinea-pigs.html

Well, the first thing you'll need to do is figure out whether or not this is a male or female. There are lots of images available on guinea pig sexing and guinea pig anatomy so that you will be able to figure this out most likely. In terms of the symptoms you've reported, I would have to see pictures and perform a physical exam to give you my take. It sounds like you could be right, but there are also many other reasons for both pain and swelling in the abdomen. I would recommend having you and your parents bring him to a veterinarian comfortable treating small mammals. Hope this makes sense.