Dogs were the best friends of mankind, loyal to their masters, and very smart, with a dog in the house, like a treasure, but the writer gave us an idea of what the owner was doing to abandon the dog.
So it's because the dog's old, the master's hair is starting to get white, the dog's hair is starting to get in trouble, the owner is just trying to take care of it because he's old and he's in trouble, and he's pulling the dog out of the street.
Blondie wandered the streets for a long time and was later seen by someone who thought it was very similar to the dog who had died before, so he adopted it. When the new owner brought the dog home, he took the food, and the dog swallowed it up, and it looked like it had been a few days since he had eaten it, and he was finally a little strong, slowly moving towards the new owner, as if you and I had died on the street.