Why are you giving your dog cat food? Cat food is higher in protein and will cause diarrhea in dogs so don't feed cat food to your dog.
When you say "have" it probably means "eat". Dog food is made to dog's dietary requirements, alike catfood with cats. The dog therefore would not like catfood.
It depends on what type and how much was given to the dog. As well as the size of the dog plays a factor in what could happen.
give them a cup of water
it is an overdose, it can give your dog an infection internaly, dont do it
It is incredibly unlikely, unless the food was already rancid or off. It is incredibly rare for canned food to go bad - unless opened and left out of the refrigerator for many days.
Don't panic. I have a friend that once ate a quarter and it came out when she used the bathroom. I am guessing the same thing will happen with the dog.
once a month
Yes, a dog does eat. Except it can't eat many things like grapes and onions and daffodils. They will be poisoned.
A stuffed dog would be perfect.
About once a week if you bath your dog very often your dog looses his oils and that is not good for him. Unless he gets into a mud hole give him a bath once a week.
That your dog is a good dog and your dog did not mean to bite the mailman it was a accident and accidents happen it can happen to anything and anyone at any time
Let your dog wonder round that area make something bad happen there , and if it doesnt give it a treat when they are proud of them selves.