Generally no. They just put the extra nutrients into their urine and the urine is florescent orange or yellow.

Yes. Prenatal and Daily vitamins are quite different.

Reproduction, hair coat issues, and GI upsets all can benefit from vitamin supplements. Any dog that makes up more than 10% of their diet with table food should be supplemented as well.

We all are and vitamins will help them loose weight without getting into any deficiency issues with vitamin or mineral imbalances.

Vitamins are enzymes and mediators that help move things in and out of cells, as well as processing nutrients to a usable form in the body.

Puppies in the fast growing phase always benefit from vitamins just as kids do.

Watch how much protein you are feeding as that will increase a puppy's hyperactivity, but these 4 wheel drive guys use a lot of calories and need vitamins to manage that high level of nutrient use.

The young and old both have an increase need for dietary vitamins to maintain their energy and functional level. Senior dogs often absorb less and store less vitamins so their requirements go up for daily use.

Vitamins should be "Made in the USA" as some foreign made vitamins were found to have lead in them and not wanted in supplements. Long shipping contributes to vitamin loss, another reason to use USA made products. Minimum daily requirements should always be contained in vitamins and the prenatal vitamins should fulfill mom's needs, which are now known for dogs.