Bear needs an MRI

Ever been scared but confident before? I was when I got married,I was when I had a baby and I am now.. My families dog is suddenly really messed up. He woke up one afternoon and had basically lost use of his spine and or back and refused to use his legs. Depending on the moment he goes from sort of okay to totally incapable. . Hes been to the vet,he was put on meds and now his meds have been modified bc they were making him so lethargic he pees himself in bed. His vet says it might be soft tissue caught between 2 of his discs but we wont know until they can afford an MRI. Right now putting him down is the last option,they will be in debt after his next visit. All I ask is that anyone that can donate a dollarr,dows,pleasr,every dollar matters right now. They've put in hundreds as it is to figure it out and gotten no answers. Please,help. Thank you,so,sosososososo much. Bless you.