When changing my cat from Hill's Prescription ID (dry diet) to Van Patten's Natural Balance, should it be gradual, or can I just take the old food away completely? I wondered if there could be a stomach problem?
Everything I've seen on this subject says to do it gradually. Make about 1/4 of the serving the new food to start. Every 4-5 days add a lttle more new and a little less old, watching for digestive upsets (constipation, diarrhea, vomiting) as you go. Within 2-3 weeks the changeover will be complete.
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