We got our rat terrier Goober from a puppy mill. He has been with us for 14 years. In his younger days, he was very active. But as he aged, he has slowed down and sleeps a lot. He is very loyal with a great personality. He has he run of 5 acres but doesn't run away. He follows us everywhere to make sure we are safe. Once he even killed a snake in our yard. He is now completely deaf and has congestive heart failure. We feed him boiled beef liver and this has helped him tremendously. There are days he tries to run like he did in his younger days. This makes him tired and he sleeps the rest of the day. He is the greatest pet we have ever owned (rather he owns us). Can't go wrong with a rat terrier.
Sandy