How much does my dog need to weigh to be spayed?

You can get a voucher for the spay, or neuter below the clinic, at the animal shelter.It can be done for free.

I don't have a job to pay a large amount for my 4 dogs (2 girls and 2 boys to get spayed and neutered) 2 are 1 yrs old and one is 6 yrs and 4 yrs old....Can you help me please? I have small schnauzers weighing no more then 18 lbs

Pretty sure depends on breed . I do know they charge less for dogs that weigh less.