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The sock vanished into his stomach one night, and I only realised because the laundry basket was empty in a way it should not have been and the dog was looking pleased with himself. By morning he had vomited twice and was lying by the door instead of at it, and the vet's hand on his belly found the kind of tension that means something is stuck, not just upset. A swallowed sock is a cliche of dog ownership for a reason, and the reason is that dogs do it constantly.
Dogs eat things they should not: socks, underwear, children's toys, stones, corn cobs, string, tampons, whole dishcloths. The dangerous ones are what vets call linear foreign bodies, long thin things like socks, tights, and string, because they do not pass the way a ball might. One end catches in the stomach or intestine and the other keeps moving, and the intestine pleats up the length of the object like a curtain on a rail. That pleating can cut right through the bowel wall.
The signs range from obvious to sneaky. Repeated vomiting is the big one. A dog who throws up several times in a few hours, especially after you know or suspect he ate something, is not just bilious. Lethargy, refusal to eat, a hunched posture, abdominal pain when you touch him, and then diarrhoea or straining. Some dogs pass a sock within a day and seem fine, which is the trap: the next one does not, and you cannot tell which you have without looking inside.
The vet will not simply wait. An x-ray or ultrasound shows the object or the tell-tale pattern of bunched intestine, and depending on where it is, they may try to retrieve it via endoscope if it is still in the stomach, or operate if it has moved into the bowel. Surgery means opening the abdomen, sometimes in several places, removing the object, and checking the whole length for damage. A section of dead intestine gets removed and the ends joined. It is major surgery with major cost, and a delay that lets the bowel perforate turns a fixable problem into a septic, life-threatening one.
Prevention is mostly about laundry discipline, which sounds mundane and is the entire game. Baskets with lids and weights. Bedroom doors closed. Socks accounted for. Anything string-like kept off floors and out of bins a dog can raid. Puppies are the worst offenders and need the house kept bare at their level until they grow out of the mouthing phase, which some never fully do.
Why they do it is partly boredom, partly the scent. A sock smells like you, which to a dog is interesting in a way a rubber toy is not, and anxious or under-exercised dogs are the ones who eat the laundry. More walking and less alone time reduces the behaviour more than any training command, because the drive is emotional, not disobedient.
Some objects are worse than others, and it is worth knowing which. Anything long and thin, tights, string, yarn, dental floss, is the highest risk because of that pleating action that can saw through the bowel. Sharp things, bones, skewers, can perforate on the way down. Absorbent things, towels, dishcloths, expand with fluid and lodge. A coin or a small smooth stone may pass, but you will not know which you are dealing with without imaging, so the safe assumption is always that it will not, until a vet proves otherwise. This is why "let's see if it comes out" is a gamble with the bowel wall as the stake.
There is a quieter version of this that owners miss: the partial obstruction, where the object does not fully block but irritates the gut into repeated vomiting and slow decline over days. It is less dramatic than a full blockage and therefore more dangerous, because the urgency is not obvious and the delay is longer. Any dog with on-and-off vomiting and a known or suspected swallow needs imaging, not observation.
After surgery, the recovery is as serious as the operation. The abdomen is sore, the dog is on pain relief and often antibiotics, and the sutures or the internal joins need protection, usually a cone and strict rest for ten to fourteen days. Eating is reintroduced carefully, sometimes a bland diet, because the gut has been handled and needs to settle. Owners sometimes think the drama is over once the dog is home, and then a stitch is pulled or the dog runs and the repair fails; the boring convalescence is the difference between one surgery and two. Our dog came home after surgery with a shaved belly and a cone and an expensive lesson that I paid for instead of him. He has not eaten laundry since, possibly because the experience was as unpleasant for him as the bill was for me. If your dog has eaten something long and is now vomiting, do not wait for it to "come out the other end." The clock on a linear foreign body runs in hours, not days, and the vet who sees him early is the vet who sends him home with his intestines intact.