She should be on canned food = more water, less waste to pass, less calories by volume, easier to meal feed.
She should be off all the fiber. The laxatives only work with sufficient water intake, otherwise they just make things worse. In a 12 year old cat I doubt she is taking in enough water.
Start with 6-8 ounces daily of any canned food she will eat that doesn't cause any GI upset. Add to the canned food 1/4-1/2 cup water to make gravy. Divide this amount in to 2-3 feedings. Weigh her every week. It is more detrimental to her to lose weight rapidly than it is to be fat. Your goal should be to reach her ideal weight in 6-12 months. Adjust quantities up or down to do that.
As for her hair loss:
Think food allergy...
When cats itch it is caused by fleas 50% of the time, food 40% of
the time, and all other allergies and problems ( inhalant allergy, mites,
bacterial infection, etc) 10% of the time.
Fleas and food must be eliminated before thinking of tests for
Purchase a flea comb and comb ALL cats daily for 5 days looking
for live fleas or the black flecks of flea dirt that looks like ground pepper.
You cannot rule out fleas in cats by just looking under the hair. You must comb
them. If you see any evidence of fleas on anybody....treat everyone.
Any of the prescription once-a -month products (Frontline,
Advantage, Revolution) are effective. Remember though that they all work great for 3
weeks, well for four weeks, they do not work for 5 weeks. Treat all cats once
every three weeks for at least 2 treatments. Do not waste your money on over
the counter products, they do not work.
Comb regularly after that and treat as indicated.
In the case of flea allergy, it is not the individual flea bite
that they are scratching. When a flea
allergic cat is bitten by a flea, they have a reaction that causes them to react
To eliminate food as a possible source of the itching, the cat must go off all the things it
now eats or has ever eaten. All
cat foods, canned and dry, all table foods, and all treats. Read all the
ingredients on the labels. Anything that is in any of those foods the cat cannot
have during the trial. If there is chicken or poultry meal, it cannot have
chicken. If there is corn, it cannot have corn. If there is fish, it cannot
For the 3-4 weeks the cat is going to be on the food trial, it is
often easiest to use cooked meats, lunch meat, or strained meat baby foods. You
can use whatever meat is NOT in your cat's current diet. Feed that exclusively
for 3-4 weeks. If all signs resolve, we will need to find a more balanced
To be effective you must be religious about this so that food as a
source of the allergy is eliminated.
While you're doing the above you can explore the house and
environment for anything your cat could be breathing in that it could be
allergic to: XXXXX XXXXX the litter, potpourri, cleaners, carpet fresheners,
plants in the house, fireplace or cigarette smoke, etc, These should be
Just a rule of thumb....flea allergy and inhalant allergies are
very responsive to steroids (cortisone), food allergy is not.
Take her off the prednisolone before she becomes diabetic too.