Good morning...this is my first post as a new member. have just got our first guinea pigs...3 eight week old females. I am making a run to attach to theire cage and was wondering what is the smallest size mesh that I can use without them getting out or stuck in. I have some that has 50mm x 50mm squares but is this too big. I know they get bigger but at the moment they are just small. I have enough of this mesh to double up to make small squares up to a height of 150mm as they wont climb up the mesh will they. Thank you. :^-