Hijinks said:
			
		
	
	
		
		
			At the vet yesterday, they said, "He's a big boy, so give him half a can twice a day."  This is a LOT of food, in my opinion, and I don't think he needs that much.
		
		
	 
Well, the devil can be in the details - the volume of food doesn't tell you how much it really is, in a dietary sense.  Take a check on the caloric content (from the Hills website)...
Hills Adult Original dry cat food (ye old basic Hills crunchies): 493 kcal/cup
Hills Feline c/d (the basic prescription stuff for uti): 309 kcal/cup
So, the c/d has a *much* lower calorie content.  To maintain a 10 lb cat's weight, you want maybe half a cup a day of standard dry food, while on the c/d you want more like 3/4 to 1 cup.
Hills suggests 1.3 to 1.75 of their 5.5 oz cans a day to maintain weight on a 10 lb cat. So, if I have my math right, you'd want about one can of c/d, and then something on the order of a third of a cup of dry c/d.
	
	
		
		
			My cats like dry food, so I was assuming two bags of that per month = $24.  $34.20 + + 24 = $58.20.
		
		
	 
If he's eating an entire can of c/d, he won't be eating all that much dry.
	
	
		
		
			I was going to try to give him half a can a day.
		
		
	 
If he's eating half a can, then he needs approximately (if my math is right)... half a cup of dry a day to maintain weight.  At that rate, a single pound of dry food will last him 11 days.  A four pound bag would do you for about a month and a half for one cat.
All, of course, modulo your cat's personal metabolism, habits, etc.
By the way, note that the stuff usually becomes notably more economical with a larger bag.  The vet starts you with a small bag, because new foods are always a test.  If he does take to eating it, buy in bigger bags in the future, and you'll save money.  We don't bother buying in anything smaller than a 10lb bag.  
	
	
		
		
			I tried giving him some of the canned and dry last night and he wouldn't touch it.  I think he ate Boo's Fancy Feast instead.  I've replaced the food in the self-feeder with the Hill's dry mixed with a little of the 9 Lives so that they get into the Hill's gradually.
		
		
	 
Ask your vet, but this is a common tactic.  Hill's says, "With your veterinarian’s approval, mix increasing amounts of your pet’s new food with decreasing amounts of the old food over a 7-day period."
	
	
		
		
			He took the pill like a champ!  Zeph held him and I put it in his throat and he swallowed it as nice as you please.  Not a wriggle.  We'll see how he acts tomorrow when he's on to us 
		 
		
	 
Good luck to you!  I hope he continues to take it without fuss.