Yes, dogs can safely eats small amounts of ice cubes. In fact, ice cubes may provide some health benefits.
As you're undoubtedly aware, ice cubes are simply made from water, which is beneficial to literally every single living organism (on this planet, anyway). In addition to basic hydration, ice cubes can also help cool your dog down on hot days. Dogs don't sweat as much as humans do, so offering them an icy snack can help lower their body temperature and keep them comfortable during high temperatures.
Placing ice cubes in your dog's water bowl can also be a refreshing way to encourage them to drink, especially during warmer weather. Just make sure you don't make the water too cold.
You can even create unique ice cubes, using frozen broth or bone broth instead of plain water. This will keep your dog cool and hydrated, but also add some extra nutrients to their diet.
Just be aware, for smaller breeds or dogs that tend to gulp their food, ice cubes could pose a choking hazard. Offering your dog ice chips or crushed ice can be a safer alternative. And while some dogs can handle chewing ice, the hardness and coldness could cause discomfort in others. Monitor your dog to make sure they're not showing signs of distress when they enjoy their icy treat.
Ice cubes could cause dental damage if you're not careful. Larger breeds with stronger jaws might handle them better than smaller breeds. And regardless of breed, exercising moderation can help prevent both choking and dental issues.
As always, consult your veterinarian before introducing a new food item into your dog's diet! If your dog eats ice cubes (or any food) and is showing signs of illness such as lethargy, diarrhea, or vomiting, reach out to your veterinarian immediately. And if your dog requires veterinary care as a result of eating any unsafe foods, pet insurance can help cover the cost of treatment.