Having pets is not frugal by any means. So, for those of us that love animals, we have to come up with ways to make pet ownership a bit less expensive. Pet bedding can get very expensive — especially when you have to change it at least once a week.
I purchased a paper shredder several years ago and shred all the junk mail that comes in the mail. Instead of just getting rid of the shreds, I use them in the guinea pig cage. First, I line the cage with newspaper. Then, I put all the paper shreds in the cage. Our guineas love lots and lots of shreds. They have a blast when the cage is first cleaned as they love the new piles that I create.
Instead of purchasing different toys for their cage, we use toilet paper rolls and tissue boxes. Munchkin is always looking for different cardboard items for them to play with.