Hi, one of my customers dogs, a cavalier king charles spaniel about 16 weeks old, has a quite large, soft round lump on its belly, ive not seen anything like it before, theyve taken him to the vets and the vet said its a umbellical hernia and is harmless but can be treated when hes neutured!?!

So whats a umbellical hernia and does anyone have any other opinions as I dont think they are too convinced that it is harmless despite the vet, neither am I!?!