I don't have donkey experience, per se, but have a lifetime of experience with horses (donkeys are equines, too).
What can the general Palo Alto public do to help? Obviously, something needs to be done or this will happen again. The dogs will go for them because they are elderly and slow.
Is there anyone to check on their well-being more than once a day? Can an emergency contact and vet information be posted? At horse stables, each horse has his owner information, emergency information, vet and farrier info all posted, as well as feeding instructions.
Is there a place to make monetary donations to ensure their care?
My son has loved these animals since he was a child, and is heartsick, as is his daughter and I.