1. It takes the recreation out of jumping. I would be afraid that kitty would associate jumping with whatever negative affects this has on kitty. Therefore, kitty may never more jump on the bed, the couch, etc. Don't really like that idea.
2. but when she attempts to jump the weight will disturb her balance...this disturbs me alot.
3. Backyard fence should be privacy fence style. Backyard must have no holes in the fence.Well, duh!!! Isn't that a given??? I was going to comment "what is to stop kitty from walking over to the neighbour's place?"
On the upside, dragging a weight around might reduce Rascal's **ahem** fluffiness ???? I think that can be the only benefit. 
Sorry. Just my opinion.
Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, champagne in one hand and strawberries in the other, body thoroughly used up, totally worn out, and screaming WOO HOO - What a Ride!
--unknown
Sometimes the most real things in the world are the things we can't see
--Polar Express
Until one has loved an animal, part of their soul remains unawakened.
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