My first dogs were all under two years when I got them. They all adapted to the new home almost immediately. Recently, I had a young dog for three days who also seemed to have no problem adjusting.
Thor was my first older dog (between 3 and 5). He was depressed for his first year. After that, he lightened up and became a great companion -- always willing to meet different people at nursing homes. (He had gone from home to shelter to trailer park home to shelter to rescue to me, all in the space of about 5 weeks. Part of the time he was under treatment for heartworm.)
Zoey was about 6. She had lots of fear issues, though she was very frienly and open to people
Sunna went from owner to shelter to rescue to me in less than a month. She is 5. She is shy, but friendly, with people. She doesn't have Zoey's fears.
Neither Zoey nor Sunna want to take a walk with anyone other than me. It seems to me that all the older dogs have had a hard time adjusting to a new home. They have no problem with the rules. Their problem is they aren't sure of its permanence.
Now: is this just my experience, or do older dogs take longer to feel at home? (They bonded fast; none have had separation anxiety -- I can leave with no problem.) They just seem to expect to be transferred again.
This is a request for information, the next post (Honey, This IS Your Forever Home) will be for problem-solving.
kjd