How did get the leash to stay on your hamster? My teddy bear hamster easily escapes from them and the dwarf is too small.
Some things that you can do to spice up your pets life are:
1. Take them outside
Dogs aren't the only animals that love to go outside, even just for a little bit. Both of the hamsters have a great time running around the grass. Just have to keep an eye out for cats and stuff. I used to have a cockatiel and a grey cheek parakeet that I'd take on hikes. They too liked to be let loose into the "wild" (chaperoned of course).
2. Get a hamsterball
Just be sure to section off an area thats easy to clean. Damn tailless rats can make a mess with their rolling toilets.
3. Feed them something other than their usual dried foods
some fresh veggies, fruits, peanut butter, unshelled nuts. Parrots love this stuff too.
4. Clean their cage
When cleaning their cage, put in lots of raw building material. Stuff like shredded newspaper, clean rags, and toilet paper rolls are great. Basically anything they can chew on or "customize" to build thier nests.