

As someone else said: helping humans find a dignified death is legal in some countries.
Your second point is more complicated though: I don’t know the laws in a lot of countries but where I’m from animals are strictly treated as property - emotional connection isn’t taken into strong consideration at all when it comes to assessing their value when it comes to legal fights but they are treated like a distinct thing different from both humans and objects in a lot of other cases (e.g. dedicated laws like “unnecessary” animal cruelty is forbidden ).
About the reason you can discuss as much as you want, the two arguments I’ve stumbled across are:
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there must not be a distinction in terms of value because that value must be purely subjective and cannot be assessed.
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There is no objective way to classify animals based on emotional connection and therefore the law can’t create categories.
Culturally we treat animals like different to humans all the time - even your dog is not treated “family” to the extreme a child would (think of child protection laws and what that would mean if they’d apply to a dog or a hamster). And now expand this to find a definition which covers both a cow someone has as a beloved pet or a meat animal.
Note that I’m trying to not say wether this is “right” or “wrong”: morale categories and laws have some overlap but they are quite lose as soon as you get specific.
My primary source was an interview with a judge who went into an hour long discussion about how complex the relation between animals and the law is and how “emotional connection” and the need for the law to be objective and repeatable are an inherent contradiction.
In short:
It’s a very tough question because there isn’t the one correct answer. Law, morality and personal subjectivity collide and make a mess out of us.





Again: depends on the legal system that statement is not that easy in that generic form.
Ik specifically thinking about the situation in which a human no longer can communicate what they want:
In Germany there is the legal concept of transferring this kind of decision power in case you yourself are no longer able to do that. The “pulling the plug” situation: the individual can no longer state their wishes directly concerning the situation but left a binding document who has the decision power in their stead.
Now you could argue that this also is “the human has to want it” as they wanted the other person to have this life and death power.