Attention:
NEVER use T61 for euthanasia alone, always applicate an autonomous narcosis first!
Once I saw euthanasia of an old cat with enormous pyometra by intracardiac injection of Dithylinum (Suxamethonium iodide) - it was really, really awfull.
So, people!
One more time, plz:
In the case you have euthanatize your patient - ALWAYS applicate an autonomous narcosis first!