In wintertime, stray dogs find little food in fields, as the landscape is frozen. Every year, the dogs gather and tell each other that if they survive the freeze, next summer they must build themselves a shelter, because their undernourished bodies could never tolerate another harsh winter.
When summer arrives, the stray dogs begin to put on weight as food becomes ample in the meadows and they can eat to their hearts' delight. As they gain weight and become more robust, they convince themselves that no shelter would be large enough to contain their enormous, well-fed bodies.
In their hearts, they know better, and they try to stay focused on the hardship they endured in past winters and the certainty that it will recur the following year. But the dogs have become fat and lazy, able to convince themselves that no home will be capacious enough to shelter them from the cold. Thus, the vicious cycle is repeated.