Dug: My master made me this collar. He is a good and smart master and he made me this collar so that I can talk. Squirrel!.My master is good and smart.
Carl: It's not possible!
Dug: It is, because my master is smart.
Carl: Russell, if you don't get up, the tigers will eat you.
Russell: There aren't any tigers in South America. Zoology.
Beta: Treats. I smell treats. I like treats.
Dug: My name is Dug. I have just met you and I love you.
Answer: We, the movie audience, are never privy to Russel's parents and their reactions to circumstances which transpire. For all we know, an extensive hunt for Russell could have been initiated by his parents off screen.
Michael Albert