It can be, especially if dogs are given large cubes or blocks of ice to chew on. This can lead to tooth fractures or a breakdown of enamel over time. It’s best to approach giving ice to dogs with caution, stick to crushed ice or shavings, and talk to your vet about your dog's dental health. It can be, especially if dogs are given large cubes or blocks of ice to chew on. This can lead to tooth fractures or a breakdown of enamel over time. It’s best to approach giving ice to dogs with caution, stick to crushed ice or shavings, and talk to your vet about your dog's dental health.