Plain unsweetened yogurt is tolerated by many dogs. Sugar-free tubs may contain xylitol, which is an emergency.

Plain only, and read the label. Small amounts of plain unsweetened yogurt are tolerated by many dogs. The sugar-free tubs are the ones that turn into an emergency call.
Two separate issues live in this question: lactose, which is a comfort problem, and xylitol, which is not.
AKC warns that xylitol causes a rapid insulin release in dogs and a dangerous fall in blood sugar. Weakness, staggering, collapse, and seizures are the signs owners are told to watch for.
“Light,” “diet,” and “no added sugar” are the words that should make you read the ingredient list. If xylitol is on it, do not share the tub, and call if the dog already had some.
Most adult dogs produce little lactase. Fermentation lowers the lactose in yogurt compared with milk, which is why some dogs handle it better, but it does not remove it.
Gas, loose stool, and a gurgling belly a few hours later are the usual signals that this dog should not have dairy. That is information, not an emergency.
For the same question one shelf over, see whether dogs can drink milk and whether dogs can eat cheese.
A small spoon of plain yogurt is the whole offer. This page will not set a spoons-per-kilo figure, because tolerance varies more between dogs than any chart would admit.
Full-fat dairy is a pancreatitis consideration in dogs with a history of it. That dog needs the veterinarian who already manages the condition before any new fatty extra.
Plain, unsweetened yogurt in small amounts is tolerated by many dogs. Sweetened and “light” yogurts are the problem, because some contain xylitol.
Many adult dogs digest lactose poorly. Yogurt has less lactose than milk because of fermentation, but less is not none. Gas and loose stool are the usual result.
Any sugar-free or reduced-sugar product that lists xylitol. AKC treats xylitol as an emergency in dogs because it triggers a rapid drop in blood sugar.
It is usually lower in lactose and higher in protein. It is still a dairy extra on a complete diet, and the label still needs reading.
It is often described that way, but the strains and doses in human yogurt are not formulated for dogs. Ask your veterinarian before treating it as a supplement.
Treat it as a xylitol emergency until a clinic says otherwise. Note the brand, the amount, the time, and the dog’s weight, then call.
Reader notes are not veterinary advice. If an animal is unwell, call the veterinarian who sees them.
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