The first thing I always recommend in the event of a suden change in appetite is a vet check to make sure there isn't some medical basis.
The old stuff I would feed her 2 cup a day (1cup in morning and 1cup in the evening) and the new stuff, the bag says that for a 40lbs dog to feed 3 cup (1 1/2cups in morning and 1 1/2cup in the evening). I looks to me that she is eating less than 1cup of her new food. My dad thinks that she just doesn't like the new food and doesn't seem to think we need to take her to the vet. I think we should. As for the weather, it has been in the 100s the past 4 days. I didn't even think that would be a factor since she's inside most of the time.Something else to consider is she may not need as much of the new food you are giving her. How much did you feed her on the other food and how much less is she eating now?
Let us know how she does.
Ok I'll start to keep track of how much she's not been eating. This has only been going on for a day and half so I know I should worry too much yet but she's my first dog. I'm glad to know that if she's hungry she will end up eating her food. I did notice that this morning she ate a little more than yesterday. As for my dad having the say over what happens is not true, since I am in my 20s and do not have to listen to my dad. He has had dogs before so I trust his judgement more than my own since this is my first dog and I don't really know what to expect with everything.Mine are inside as well most of the time, but come summer...
I would watch her. And the bag is an estimate...if mine ate what the bag recommends, they would both be porkers!
Measure exactly what you give her for each feeding and try keeping track of what she doesn't eat. If it's that she doesn't like the food, when she gets hungry she'll eat.
You didn't say how long this has been going on. And it sounds like your dad has the say over what happens to her so maybe you could call your vet and see what they have to say.
It's ok. I understand why you would think that I was younger than I am. I had to move back home after I finished my Bachelor's and am waiting to get into a Master's program.Sorry, I thought you were younger from your statement about your dad and the dog. It's hard to know when to call and when not to. And like Tooney mentioned, check the calories for each food (if you still have the bag for the old stuff). Better quality does make a difference on how much you have to give them.
Good luck. Hope all goes well.