It could indeed be anxiety. You say she's "cage-broken" but if she's needing extra locks etc because she finds ways to break out, then it's pretty clear she's not exactly relaxed and happy in there. What do you leave her with to do all day?
Possible anxiety issues aside, just as a FYI about how long you can expect a dog to hold it's bladder - well 8 hours is about the humane limit. For puppies and young dogs the general "rule of thumb" for how long you can reasonably expect an animal to hold it (in hours) is the age in months + 1 to a maximum of 8 hours. Some dogs can *never* last that long, some can go a little longer - it depends on the individual. So don't think that just because some other dogs can hold on that it's the case for all of them.
IMO a dog shouldn't be asked to do that daily for any extended period. The body (human or canine) is designed to flush itself of waste on a regular basis. I wonder about the long term health effects of preventing a dog from expelling it's waste, especially if that also means limiting it's water intake.
Possible anxiety issues aside, just as a FYI about how long you can expect a dog to hold it's bladder - well 8 hours is about the humane limit. For puppies and young dogs the general "rule of thumb" for how long you can reasonably expect an animal to hold it (in hours) is the age in months + 1 to a maximum of 8 hours. Some dogs can *never* last that long, some can go a little longer - it depends on the individual. So don't think that just because some other dogs can hold on that it's the case for all of them.
IMO a dog shouldn't be asked to do that daily for any extended period. The body (human or canine) is designed to flush itself of waste on a regular basis. I wonder about the long term health effects of preventing a dog from expelling it's waste, especially if that also means limiting it's water intake.