Thank you for your question regarding your 13 year old girl Bobbi who seems to have developed constipation, and who only seems to toilet once every 4 - 5 days. It is definitely a concern that she isn't pooping every day, and for her to only go every 4 or 5 days is definitely a worry. It is definitely worth trying the miralax, and hopefully that helps to get things moving.
There are a number of reasons cats can become so constipated. If Bobbi moults a lot and/or is a longhaired cat, I would encourage you to brush her regularly (daily if possible) as sometimes hairball impaction can be part of the problem. A diet high in fiber is a good idea and you can buy some Veterinary formulated products that may help. Royal Canin fiber response is formulated specifically for cats with this issue. Hill's R/D is also a good one, although it is formulated for weight loss also. The other option would be to mix some psyillium husks and seeds (like metamucil) on top of your girl's food
. Where possible - feed your girl wet food only, and also encourage her to drink plenty of fresh water. You could also ask your Vet for lactulose syrup which can also help to get things moving. Also make sure you keep up to date with Bobbi's worming treatments.
The medication your vet mentioned is called Cisapride. This helps to get the ingesta moving along the intestinal tract by assisting contractions. You could definitely consider this for your girl if all of the above fails. You can read more about this drug online here: http://www.petmd.com/pet-medication/cisapride
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