Daisy has had very runny poops for 3 or 4 days now. I changed her from Nutro Ultra about 3 weeks ago to Blue Buffalo. She was fine up until a few days ago so I don't think it's the food. I did give her some canned pumpkin this afternoon. I haven't noticed a difference yet but it may not be through her system yet. How long does the pumpkin typically take to firm things up? Would it take the new food this long to show that it doesn't agree with her?