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Hello, I'm Dr Gary. I've been practicing veterinary medicine since 2007. I look forward to helping with your questions/ concerns.
That's awful, I'm sorry to hear this.
The blue tongue is a sign of decreased oxygenation. It can happen with strangulation, as well as heart disease and heart failure. It can also happen with choking.
One big thing we see with strangulation is pulmonary edema- bloody fluid in the lungs. Most of these dogs will have red watery fluid coming from the nose and mouth after death. It can also happen with heart failure, but most owners are aware of a heart murmur or heart condition from a previous vet appointment.
If she wants to know for sure, have a necropsy (autopsy) done on the dog to get a cause of death. Then go forward from there regarding the authorities if needed.
Let me know if you have any other questions. I'm sorry again for this situation.