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dogs jumping off a high bridge for no apparent reason!!
So my analysis:
1. They jump only on sunny days
2. They jump from a bridge crossing a river
3. They jump between two specific parapets
4. They are long nosed dogs: collies, retrievers and labradors
Questions:
1. Why do not they jump on rainy days
2. Why do not they jump from bridges that are not crossing a river
3. Why do not they jump from bridges that have no pair of parapets
4. Why do not short nosed dogs jump from the bridge
What do dogs use their nose for?
Answers:
1. Dogs use their nose to smell. Long nosed dogs may be expected to have a far better sense of smell than short nosed dogs.
2. On rainy days what dogs cannot smell is the location of pools of water, since everything smells like water on those days
3. A pair of parapets can function as a funnel of air flow, especially on a sunny day when water evaporates more strongly and the air when heated by the ground rises more strongly.
4. Collies, retrievers and labradors all are water dogs.
Thus: These water dogs on sunny days smell the water vapor that has evaporated from the river in the rising air that is funneled upwards by the pair of parapets. Mistakenly believing that there is a pool of water on the other side of the wall between the parapets, and wanting to play in the water and wanting to cool down in the pool, they jump the wall.
I recommend that that part of the wall be torn down and be replaced by an open fence.