How much does she weigh? My pup is gaining about 10lbs a month and he is around 42lbs at 4 months
Males are typically larger than females, so it makes sense for your male to be larger. My female is almost 5 months and 27 pounds, but that doesn't mean she's too skinny or she eats crappy food or she's mixed. She's just a smaller female.She seems pretty skinny for being 5 months old, especially compared to my 4 month old who is bigger. You should really be asking your vet these type of questions. She could have worms or she could be sick. It could also be the type of food. I know my vet recommended a puppy food that had a lot of calories which puppies need to bulk up at an early age. She could also be mixed or it could just be that your pup hasn't grown into her body yet.