Why is my 5-month-old puppy not growing? Could worms be the cause?
Hello, and thank you for using Petco Pet Education Center, formerly Petcoach. I agree that Max looks a bit smaller than an average 5 month old lab. However, severe intestinal parasites would typically cause a dog to look very skinny and in the picture you provided, Max doesn’t look alarming thin to me. Deworming should be done a few times in puppies, so I do think it’s a good idea to deworm again (under the guidance of your Vet), but I don’t think his size or temperament are likely to be related to worms. If you’re concerned he’s not growing appropriately, I recommend having him examined by your Vet, and run some bloodwork to help rule out systemic diseases which could influence growth. However, my suspicion is you simply have a petite lab and his size is normal for him. I hope this helps!
Updated on September 23, 2025