(By: Arthur Stryker) - When dealing with guinea pigs, many mistakes are made by a simple action: visiting a pet shop. People imply by default that every and any product offered by a shop for a certain type of pet is legit and safe. Unfortunately, it is not. One of those products is a leash for guinea pigs, which in fact is a very bad idea. Cavies have very delicate spines and bone structure which cannot tolerate stress generated by hamster wheels. Avoid at all costs.