What on earth do I do with elderly pony who I'm fast approaching being unable to afford to keep 
Said pony is around 26, I've had him 23 years. I adore him and he is fit and healthy and, touch wood, not required or requiring extensive medical involvement to keep him healthy.
I used to keep him on part livery, and had reasonable savings put aside for him. Then covid came along, my work situation changes and he went onto DIY livery and my his savings started depleting as I temporarily lost my job.
I found work again (less well paid) kept him on DIY to try build his savings back up. Tragically DP died so I'm now a single parent, on a reduced income compared to what I was before. Pony is now on grass livery, but with the increased cost of life in general keeping him at all is possibly going to be impossible. Pony savings are pretty much gone, my own savings aren't exactly high, just enough to cover car issues, household appliance replacements etc and once energy increases comes in, I will have very little money to put away each month.
So what on earth do I do with my beloved pony 
A) have him sadly put to sleep, he's had a good life (sadly a decision I might have to make sooner rather than later whilst I can even afford this option)
B) try to keep him, accept I can't put any money away for a rainy day and pray nothing goes wrong, 2.5 years till DS goes to school and childcare costs decrease
C) keep him and pray I find higher paid work soon (unlikely but not impossible, but I also am solely paying childcare etc, so have to stand the increase alone if higher pay = higher hours)
D) desperately try to find someone who will take him as companion (unlikely as lami prone and gets easily attached)
E) suggestions welcome
For context dear pony costs around 230 a month (averaged to include feet trimming and any extras, as I'm currently keeping him as cheaply as possible)