I think a good general principle for speaking with people on the internet is "the principle of charity".
You need to think of the best possible interpretation of the other posters comment, and always assume you're speaking with someone intelligent in good faith.
For instance here, my best interpretation would be that the person is both confused between carbon dioxide and carbon monoxide, and is unaware that vets will assist in helping pets pass away.
The other interpretations: that the person is a troll, that the person is needlessly cruel, that the person cares more about saving the vet fees than the feelings of their dog , or that the other person is just an idiot don't contribute to a healthy discussion.
You need to think of the best possible interpretation of the other posters comment, and always assume you're speaking with someone intelligent in good faith.
For instance here, my best interpretation would be that the person is both confused between carbon dioxide and carbon monoxide, and is unaware that vets will assist in helping pets pass away.
The other interpretations: that the person is a troll, that the person is needlessly cruel, that the person cares more about saving the vet fees than the feelings of their dog , or that the other person is just an idiot don't contribute to a healthy discussion.