Don't kill the poor animals! That's cruel! Leave them with family or bring em to a shelter
Have you considered what killing your pets will do to you at a time when you will already be highly emotional, or if your own attempt fails?
I suggest at least thinking about a no fault surrender at a shelter or rescue. Worst case they would have a guaranteed peaceful exit by a professional without you having to put yourself and them through that. If your plans fall through that surrender could also possibly be reversed. If you don't like that, some rescue organizations have pet retirement homes that will guarantee a home for elderly or sick pets until their death for a fee.
I post this only because the fallout of an aborted attempt ruined my life and I would hate to see someone else suffer similarly. I wish you peace whatever you decide.
Everyone has a choice as far as what they will do with their pets whether that person is has a physical illness that is going to result in death or whether they have made the decision to end their own lives.
Yes, bringing them to a shelter may provide them with a chance to have another home but a lot of animals, especially older ones, can languish for a long time while waiting to be adopted.
Butterflyfree has already stated that their cat and dog have lived the majority of their lives, have health issues and that separating them would traumatize them.
Being older animals who have lived together for so long and then being sent to shelter? That would be taking them from heaven and putting them in hell.
Butterflyfree is overwhelmed and having a difficult and very painful time coping, they've done the best they can for the pets whom they love and have made humane arrangements for a quick and peaceful ending.
Sometimes pets get the best they can get and the most of what they can get before life and circumstances interfere.
Kind of similar to living a human life.
There are people who cannot imagine putting their pets but sometimes circumstances call for and we could make the argument that putting pets in a shelter is a way of easing a person's own guilt because they don't want to deal with the challenge of doing the kinder, more humane thing.
Under these conditions I would also opt to have my pets sent over to the other side rather than worry about how long they would have to stay in scary, unfamiliar environment and wondering if the whoever adopts them would offer the same love and understanding that I did.
Butterflyfree, I'm sorry that your pain has brought you to this place. You do what you feel in your heart is the right thing to do.
I hope you are at peace with whatever decision you have made for yourself and I wish you peace and blessings.