I generally do think it is a puppy trait...they just go for anything that moves or flies around..it amuses them..As for other objects etc. again the teething thing as well..something to chew on. My Dustie will give things up if he knows he can't swallow them..His favourite are clothes pegs..but he will drop them...but paper is a problem..any sort and particularly the Daily Newspaper...I have to get to the letterbox before he does..
or there isn't much left of it...
My other Yorkies in the past had similar traits..but they did grow out of it with patience..and telling them No when you disaprove...They are young and like naughty teenagers ...I reckon Dustie is now about 15 in human years..he is being a rebel..
Chris x