I know of no dietary deficiency that would cause a dog to eat carpets.
Dog eating carpet strings.
Do you think your puppy may be teething.
Dog licking the carpet one possible explanation for this behavior is that the dog has a digestive problem.
I d recommend that you take him to your veterinarian.
You wrote that your dog ate part of a rug and now has a string hanging out his rear end.
The digestive tract also called the gastrointestinal tract is long.
Usually this ends by the time your puppy turns 6 months old.
Indeed when dogs have an upset stomach their instinct is to eat grass so they can induce themselves to vomit but in a domestic setting at home there s no grass to eat so the dog reaches out for the carpet or anything else in reach.
Samuel from sittingbourne kent managed to beat a pot smashing tortoise called timothy and plenty of.
The concern is this.
Based on the new information that this behavior does not happen when you are not home but in fact when you are at home it is likely to be pica which is the consistant ingestion of non food item.