My rescue Lakeland terrier cross has not eaten any of her food since yesterday morning. She's fed twice a day, Butcher's wet food and usually wolfs it down. BUT, she has happily eaten the odd Twirler treat and other bits and bobs, is drinking water and seems her normal self in all other respects. She has pooed normally this morning too. Should I be concerned? I thought I'd get some fresh chicken to try her with later.