I personally, would NEVER buy Gucci toys that are meant for children, nor used toys as I DO NOT HAVE ANY IDEA where they have been or what pets/things have been on or around them and WE SHOULD ALL KNOW SIMPLE LAUNDRY DETERGENT DOES NOT KILL PARVO (you just never know).
Anyhow, if you are going to do that Just make sure you check them out for holes or loose pieces as they are MEANT FOR CHILDREN, thus childproof but NOT DOGGIE PROOF or DOGGIE SAFE ...
Also, BLEACH THEM and Dry them on HIGH even if it ruins them a bit... Better Safe than Sorry .. Hope that helps!!