Developing a relationship with an animal is very therapeutic, I think. When each of our sons left home, we got another dog. Thankfully, we only had two sons, staggered 4 years, so the dogs were staggered, which worked out fine as each pet passed on and we took on another one. Animals are unconditional, they know your feelings and react accordingly, good or bad.
I got to study in detail how our 8 year old Labradoodle interracted with our 1 year old grandson over Christmas. At first, each was cautious and tentative. After one day of supervised but not overly constrained interraction, the 75 lb Labradoodle was bringing the 1 year old her toys and very gently touching the baby's face with them, just like she does with the adults, just much more carefully. When the baby wasn't interested, he pushed the toy back towards the dog and the dog calmly walked off and waited for another opportunity. When the baby was upset, the dog was concerned. When the baby was asleep, the dog napped. Very enjoyable to observe. We are blessed. God is good.
Joe