I am so very sorry.
How kind of you to think of others even at this sad time.
Most Tierheim will be happy for any donation; simply call and ask.
In addition to Mrs D's excellent suggestion (Tierrettungsdienst/Tierheim PFötli are wonderful folks), another is the Tierheim my Heffalump came from, Tierheim Surber. They could also likely use anything you have to donate: http://www.tierheim-surber.ch
Here's a (probably not fully inclusive) list of Tierheim searchable by canton, put together by the Tierdatenbank: https://www.tierdatenbank.ch/de/adre...rheime--5.html
And a list of Tierschutzvereine, also searchable by canton: https://www.tierdatenbank.ch/de/adre...ereine--6.html
Wishing you and your family all the best at this difficult time.