Best try to keep an eye on the pup as far as the weeing and chewing goes, the chewing needs to be watched as he starts teething which at 14 wks it may have started. The only advice I can give re the muddy paws, and I know its time consuming is have a damp cloth and a towel by the back door and wipe down his paws each time he comes in. I do this with my two as Ihave a cream carpet the dogs soon get used to the idea that they have to be wiped down and now they even wait for me to do it.

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