Our dog (16yo, collie x mongrel) has kidney disease but for the past 7 months has been on the Royal Canin renal diet and she's doing well. She is active and still runs around playing with her toys every evening. She's not as keen on walks (unless it's somewhere new, in which case she's interested) and she sleeps a lot more now.
She has recently started trying to eat (clean) tissue paper. I looked it up and it can be a symptom of Pica, which is found in humans and animals, as a deficiency of zinc.
Has anyone had experience of this with their dog, and can I give her dog zinc supplements without it being detrimental to her kidney condition?