The first thing you need to know about Sylvester Stallone's Instagram account is that it is a veritable treasure trove of behind-the-scenes pictures from his classic films. The second thing you need to know is that he also posts pictures while filming his current movies, which is how we found out that not only did he keep the turtles his character purchases in 1976's Rocky, but they're still alive.
Sylvester also notably owned Butkus, the Bull Mastiff from Rocky and Rocky II. At one point before the initial film's release, money was so tight that he had to sell the dog. After six months, he bought Butkus back and the dog stayed in the Stallone family until 1981.
The moral of this story is that Sylvester Stallone loves animals, and we love him for it.