Help me raise money for my dog urgent dental problem

Hello,
I’m a 21 y.o girl, living on my own with my two dogs and a cat. They’re all shelter animals and They’re my everything.

my older dog, chico (11) suffers from a massive dental problem. He had his teeth cleaned at the vet but it didn’t take long for the teeth to get bad again.
I was about to get his teeth fixed, but then he’s happened to be allergic. He was scratching himself and biting his skin, hair has fallen down around his eyes and mouth etc. So we went to the vet and tried to eliminate some of the possible causes. I’ve bought him special food for alergic dogs. Vet also gave us some meds for the scratching, shampoo and eye drops. He doesn't want to eat dry food anymore, because it the teeth hurt him, but giving him soft meat will make the teeth even worse. Plus he needs to eat the special dry food becuase of the allergy.

As if that wasn’t enough, corona came around and made the financial situation hard for many of us. I thought the teeth could wait and hoped I can go work as soon as possible, but one of his tooth has fallen out a while ago and I just don’t want him to suffer... I need to get him tested first (liver and other organs as he’s an old dog) and then hopefully everything will be okay for anesthesia to get his teeth completely cleaned.

I can’t afford to help him right now, I’ll be forever thankful for any help, even small amount. Thank you very much.