Hi
I have bought some marrow bones from the butcher for my 3 month Dachshund but I am not sure how to give them and how often.
Can they be cooked or should they be given frozen or fresh? How many can be given a week?
Thanks for any help.

One should last him ages. 

They should initially be given raw, but I always put them in the oven on high for an hour at the end of the day to kill any bugs and cook the marrow so that it doesn't smell and can be around for ever after that.

One should last him weeks, and maybe forever once, but he will appreciate a new one once he's got most of the marrow out.

Smaller bones he can actually chew and eat are better for his teeth, and should ALWAYS BE RAW.  These can be viewed more as food, (depending how much meat is on them) where the marrow bone is a toy/recreation.  Too much marrow can make your dog loose s restrict chewing to an hour or two daily until he gets used to it.  To much bone actually eaten can make them constipated.

All bones should be fed raw and never cooked at all. Even smelly ones are much safer in their raw state than cooked !

Marrow bones will last a small dog for ever, no need to take it away!! but if you want a bone that can be eaten and considered as part of a daily feed ask your butcher for some lamb rib or pork bones or chicken wings/carcasses, these are a softer type of bone and have a good nutritional value to include with your daily feeding.

Eating bones can make the poo's very hard and firm, sometimes white and crumbly. This is not constipation, but a normal process of bone consumption. (quiet normal !) The firmness also helps tremendously with expressing the anal glands.
My girls have meaty bones sometimes as much as 4 days per week (depending on what the butcher has to spare) it will be considered as part of daily rations. None of them have ever been constipated!!

Have fun.

Too much bone will cause constipation, your feeding a correct raw MEATY bone diet, not bones as a supplement, or on their own.

I have never had an issue with blasting Marrow bones in the over, but by then they are not consuming them as a meal just using them as a chew

I went to the vet with him on Friday and the vet has told me to hold off on marrow bones until he is a year old (the dog that is not the vet :-) I asked him about raw or cooked and he said that he prefers to give them cooked as there is a risk of contamination from raw or frozen bones.  I found that interesting as I would have given the bones from frozen.  I suppose different vets have different opinions on this.
What I need to find is something that my dog can chew on without causing damage.  I shall post on this separately.

I am surprised a vet should say cook your bones!
Most people with any knowledge of raw products would know that a raw bone is much safer than a cooked one.
You will be quiet safe to feed your bones from frozen if you wish.
A slightly softer type of bone if you wish for a youngster would be either a lamb rib or pork rib. This would keep ypur puppy happy and less chance of any broken teeth.

Don't be put off or frightened about raw bones, your puppy will not get contaminated!

I wouldn't worry at all about contamination. I feed raw to my dogs and their recreational bones are given straight from the freezer and once the dogs have had a good chew on them they go back into the dog freezer again ready to come out for the next session. The bones might last for several sessions so are constantly frozen and refrozen. Have been doing that for nearly 10 years now and my dogs are all fine.

Never feed cooked bones as cooking them makes them brittle and they snap into sharp shards that can cause damage. Marrow bones are good for gnawing on - the marrow can be quite rich so for the first few times my dogs have them I scoop out some of the marrow just to try to prevent any upset stomachs.

Ingesting too much bone at one go can cause problems so just make sure that they aren't eating lots at one time. When fed as part of a raw diet (as opposed to recreational bones) the ratio of bone to meat helps ensure they don't get "bunged up".

Bones should always be fed RAW and RAW only- never cooked you have the chance of them splintering.
If worried freeze them for about 10 days all should be fine & throw back into freezer when the dog is done with them.

I feed frozen Turkey feet to my Dane cross & she loves them- these I feed with her liver & kidney & also on tripe days :)