https://www.vetsurgeon.org/f/clinical-questions/23225/guinea-pig-anatomy I recently had to deal with a male guinea pig that had a blocked bladder OOH. I scanned the bladder with showed a thickened bladder wall, suspecting a bladder tumour. I attempted to catheterise the pig, but just couldn&#39;t find a urethral opening! Whereen-USTelligent Community 10https://www.vetsurgeon.org/thread/142029?ContentTypeID=1Thu, 27 Aug 2015 23:10:11 GMT146601cc-3922-4be7-9974-7e1d4e45a66b:81e4d164-dfc3-4784-b8d9-75a534f748c7Suzanne Kelly<p>Whoops just noticed the article Vicky posted - that gives a much better explanation!</p><div style="clear:both;"></div>https://www.vetsurgeon.org/thread/142028?ContentTypeID=1Thu, 27 Aug 2015 23:09:20 GMT146601cc-3922-4be7-9974-7e1d4e45a66b:4245953c-85ae-4156-bad8-d32b9da8d91fSuzanne Kelly<p>Sedate piggy, put him on his back. Gently extrude the penis and pull it caudally ( so the tip is facing caudally). Now you can place a fairly large catheter if you gently push it into the top opening. Dorsal as you look at it. The ventral bit has some mad spiky things, don&#39;t go there. There should be no resistance and it should slip in easily.</p><div style="clear:both;"></div>https://www.vetsurgeon.org/thread/141965?ContentTypeID=1Thu, 27 Aug 2015 09:01:52 GMT146601cc-3922-4be7-9974-7e1d4e45a66b:4a5521e6-3bf1-4d4f-ae31-137984780bd9Anthony Dennison<p>Thank you for that!! Both me and another vet, who has an interest in exotics, couldn&#39;t find anything!</p><div style="clear:both;"></div>https://www.vetsurgeon.org/thread/141925?ContentTypeID=1Wed, 26 Aug 2015 14:55:27 GMT146601cc-3922-4be7-9974-7e1d4e45a66b:0e612564-7dfb-4deb-bc8e-3822192d9184Vikki Halliday LLB<p>http://www.pubfacts.com/detail/17585353/Urethral-catheterization-of-the-male-guinea-pig-Cavia-porcellus.</p><div style="clear:both;"></div>https://www.vetsurgeon.org/thread/141923?ContentTypeID=1Wed, 26 Aug 2015 14:50:11 GMT146601cc-3922-4be7-9974-7e1d4e45a66b:8e8e614b-a563-4197-9fb4-43caad0185feVikki Halliday LLB<p>It&#39;s a slow day at work.... I&#39;m not a GP expert!</p><div style="clear:both;"></div>https://www.vetsurgeon.org/thread/141922?ContentTypeID=1Wed, 26 Aug 2015 14:49:42 GMT146601cc-3922-4be7-9974-7e1d4e45a66b:d9255d71-43cc-43ff-b697-5958d06dc8b1Vikki Halliday LLB<p><a href="https://www.vetsurgeon.org/cfs-file.ashx/__key/communityserver-discussions-components-files/88/Urethral-catheterisation-male-guinea-pigs.pdf">www.vetsurgeon.org/.../Urethral-catheterisation-male-guinea-pigs.pdf</a></p><div style="clear:both;"></div>