https://www.vetsurgeon.org/f/clinical-questions/12395/open-fontanelle-in-puppy I have seen a puppy this evening that is a daschund x JRT (according to the owner). On examination he seems to have what I can only imagine is an open fontanelle on the top of the skull around 0.5cm diameter. I obviously didn&#39;t poke it too hard but iten-USTelligent Community 10https://www.vetsurgeon.org/thread/69152?ContentTypeID=1Fri, 03 Aug 2012 23:16:33 GMT146601cc-3922-4be7-9974-7e1d4e45a66b:28d35f20-4c06-4974-aa3b-b994750019e6Nicola Lawlor<p>Thanks - I presume there is not a huge risk if it stays open for injury to the brain? I doubt they want to breed - Already discussed need for neutering this evening anyway with the retained testicle issue should it persist and that seemed to be well received advice. </p><div style="clear:both;"></div>https://www.vetsurgeon.org/thread/69149?ContentTypeID=1Fri, 03 Aug 2012 21:31:06 GMT146601cc-3922-4be7-9974-7e1d4e45a66b:022d8efc-e47c-4856-b2c4-fc6a6cebb447Mark Lowrie<p>There&#39;s nothing to worry about if no clinical signs evident (eg seizures or HL ataxia). Most pups would have closed fontanelle by this age but some never close. I&#39;d just warn them against breeding from this pup In the future.</p><div style="clear:both;"></div>