I use something called Pet-tabs. Their avail at most petstores and alot of websites. They are affordable, and work very well! I have two dogs, and they were getting one each everyday. I figured it was just a good idea to give to them.
Then I had ran out and wasn't able to get to the store for awhile. they went two weeks without them.
I noticed a considerable differences in their energy levels, and my smaller dog started having his skin issues come back, super dry skin and a booboo on his chin stopped healing.
So I just wanted to say, that these worked out very good for my pups and I suggest you try them out unless otherwise stated by your vet

Hi there! How much does this Pet-Tabs cost? Is it compatible for all kinds of dogs? I haven't given anything aside from dog food to my pet. So far, I think she's doing okay. I'm afraid that some dog vitamins may have disadvantages to my pet.