how much does it cost for a guinea pig to be neutered
1 However, this procedure is uncommon with many local vet offices and shelter; therefore, it is best to find one that is experienced. 2  According to the rescue MGPR.org, the Washington DC area charges anywhere around $100 to $125 to have a guinea pig neutered. If adopting a guinea pig, check with shelters that already have performed the surgery. 2  While it may be hard to find one, it is going to be able to save at least $100 to $150 on top of the adoption fee.