I have a chocolate lab, which will be 5 months next April the 1st. We go to the park every morning for her to walk and explore and play, she usually will not engage with me no matter what I do which is ok... I guess she is too excited about the environment... but when we arrive home she is ignoring me all day long... No matter what I do when she is not sleeping, she will just walk around ignore her toys and bite walls, corners, doors... I try to get her attention with funny sounds, toys, nothing... In the afternoon we do another small walk (15 min at her own pace), again, very friendly with strangers and dogs, she seems so happy but indoors... she is a different dog... I've been doing positive reinforcement training but lately, she is not paying attention at ALL! is this normal?