Dogs sometimes manage to get strange things into their stomachs. Gamgee opened a dog that died suddenly in violent pain, and found a marble lodged in the duodenum about two inches from the pylorus. The dog was the companion of some boys who were playing at marbles. The marble had passed through the stomach, but became fixed in the bowel, causing no doubt obstruction and inflammation.

Another dog accidentally swallowed a three-pronged fork, six and a-half inches long, whilst being fed with flesh. No particular symptoms of pain or fever followed. The dog was fed on cow's liver to distend his stomach and open his bowels, and drank sulphuric acid weakened with water, with the intention of assisting the stomach to dissolve the iron. A few days afterwards the fork began to point through the skin, and was successfully removed by operation. The ivory handle was completely digested away, and the iron bore indications of having been roughly used. The dog did well, and deserved to live after so remarkable a feat.

There is on record another case equally extraordinary. A hound swallowed a bone, which stuck fast in the upper part of the gullet and could not be got out. In attempting to push it downwards into the stomach by means of a fork, handle foremost, the fork itself, slipping from the clumsy operator's grasp, was also swallowed. Two months afterwards the owner felt the fork lying in the abdomen in the axis of the dog's body; it afterwards made its way backwards until it arrived in the rectum, when he was able to grasp the handle and bring it out for about two inches, but no more. A month after this, the abdomen was opened into, and the fork, with its prongs in the bowel and its handle among the viscera, was extracted. In three weeks the dog was well. Such is a summary of the account given.

Various other foreign bodies have been swallowed and afterwards found in the stomach; including hair, straw, dog-grass, coins, lead, sponge, chalk, stones, etc. The stomachs of dogs that die of the disease called "dumb madness" are filled with all kinds of rubbish and filth.

The Spiroptera sanguinolenta is sometimes found in the dog's stomach; but it causes no particular symptoms indicative of its presence.