It's not safe to feed your dog cooked chicken bones. These bones are very sharp and splintery, and when the dog swallows the bone, it could cause problems to the intestines inside. It's not good on a dog's stomach. Also, your dog can choke on the chicken bone. I recommend you talk to a veterinarian about this. Most vets will not recommend you feed your dog a chicken bone. It also increases the chances they will jump up on the table for them later on for the bone. Raw bones dogs can chew on, or rawhide.

Dogs should never be given dog bones to eat. It is very dangerous. Cooked chicken bones are very dry and brittle and can puncture the inside digestive tract of a dog, causing a lot of damage and potentially killing them. These bones are typically long and skinny and cannot be digested quick enough to avoid hurting the animal.

Please tell your friend this. It would be a tragedy for her to lose her dog over something that is easily preventable.

There is all sorts of stuff over the web about this issue.

1. Raw bones are good for your dog. They do wear down their teeth and dogs have been eating bones for as long as dogs have existed. Raw bones....
Small thin ones like fishbones - you wouldn't eat them as a human - they might get caught in your throat - why would you feed them to a dog. Any small bones potentially have the same issue.
To save your dog's teeth - give the dog a chew toy. To get them a balanced diet of calcium etc - give them a bone to chew (see BARF below).

2. Cooked vs raw Bones.
Raw bones are hardy and flexible. Cooked bones are fragile and have chemically changed to be largely indigestible. Not much nutritional value for a dog eating cooked bones.
Cooked chicken bones are small and can splinter. Don't feed cooked chicken bones (or pork bones) to your dog. Most of the time it wil be fine - same as when you eat fish - you are careful - all is good. But if you make a mistake or an accident occurs - Neither of you are going to have a good time of it.

There is a dog diet called bones and raw food (BARF) sometimes called biologically appropriate raw food. It mimics a wild and natural diet. Cooked bones are not recommended. It's natural for a dog to wear down its teeth as it gets older by eating bones.
Note that some dogs wolf down their food and some chew it well - just like humans - you may want to consider the eating habits of your pet before feeding them bones - especially smal ones.
Giving a dog a big bone also gives them something to conentrate on for a while and may train them not to eat so fast. Brisket bones and lamb flaps are good choices from the butcher.

Note that pressure cooked bones that have been given a good long cook are broken down even further and become mushy - and therefore safe to feed to dogs - but they have no nutritional value - so why bother.

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