My little baby dog who is one year old has recently started chewing up everything in sight. Today I noticed he has been knawing on my 9 yr old daughter's mattress. He has indulged in christmas ornaments, tennis shoes, slippers, & make a brand new barbie a quadrpalegic amputee and destroyed baby alives baby bottle. He is in all the time except to potty, He has numerous chewey toys, etc and is just downright behaving like a little chit. He has also expressed major jealousy in my opinion to our other dog.