My five cats are not eating well!
	
	
		I have cats:  a male 11 1/2 years old, a female 5 years old, a male 3 1/2 years old and two little girls aged 15 months.  Four of the cats (the four younger ones were all strays that I brought home.  I had always given my cats wet food with a large feeder of dry food at the side.
Recently they stopped eating the canned food so I changed the flavors, brand, etc.  They eat a little bit and leave the rest.  I started alternating dry food with wet food.  When it's a new bag of dry food, they dive in and eat like crazy once or twice and then walk away.
I keep changing their food but nothing seems to work and I am afraid, though none of them look underfed, that they are not getting enough food.  
Any help will be appreciated.