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Unfortunatly, if you don't have the surgery, you open yourself up to expensive treatment to treat any infections that might come from this.
There are some groups that can help pay for the treatment if you need assistance.
Check out these links and see if they can help. I recommend contacting uan first. They have a great staff and people respond quickly. Here are some organizations that help individuals as well. Help-A-Pet http://www.help-a-pet.org Focuses on helping low income individuals with all kinds of vet work, including preventative care and non-emergency treatments. They work with all kinds of animals. IMOM http://www.imom.org Focuses on emergency medical care for dogs and cats that require expensive treatment to live. United Animal Nations http://www.uan.org/ Focuses on disasters and helping low income individuals or rescuers. They work with all kinds of animals.
I hope this helps!