need for deworming regularly
Will play an important role in the dogs weight?
what does deworming does?
If deworming is not done what will happen?
How often deworming should be done for a 14month
Will deworming causes the bitches to get on heat?
I'd recommend that you read my Canine Worms page as it should have most of the information you need to answer your questions.
In general worms rob your pup of the nutrition he should get from his food, they can also cause internal bleeding. Some worms such as Heartworms can cause severe heart damage and death. ANY worm infestation left untreated has the potential to kill your puppy.
Deworming a female pup or dog will not cause her to have her heat cycle, they are independent of each other. If a pup has been dewormed at least 3 times between the age of 7 and 16 weeks, after that an annual deworming should be enough. However, parasite prevention treatments should be used to make sure the pup doesn't have fleas (which cause tapeworms), or pick up hookworms etc. Heartworms are transmitted by mosquitoes and using a monthly heartworm preventative is a MUST.
Hope this helps, best of luck with your pup.