A. It's a disorder of appetite ( perverted appetite) Cause can be hard to find. It can be connected with deficcient diet, gastrointestinal tract disease, behavioural problem, obsession, worms. See your vet to exclude all health issues. You can try to add to his food good suplement, deworm him with high quality drug and buy some special muzzle with double top to prevent him from eating things during walks.
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