Hi Karen.
You really do need to see a vet, sooner than over a month from now.
Pruritus (itching) can make a dog feel utterly miserable and can quickly spiral into bigger problems, whether from injuring the skin from scratching/biting/chewing to soothe itself which can then create secondary skin infection, or an ear hematoma (which I promise you, you do NOT want to have happen) from a hard shake or scratching.
Did you know that most itching is not from a food allergy? It is more common for a dog to have other things causing the symptoms, like flea bites, mites, fungal/bacterial infection, or environmental & inhalant allergies.
It’s great that your breeder is involved. Your breeder is right that chicken could be a food allergy for your puppy and food allergies do commonly show up before 1 yr of age. Chicken and beef are top food allergens for dogs with food allergies.
But did you know that food allergies are actually not very common in dogs? Or that, in a food allergy, symptoms typically can continue for some time after switching over to another food? This is why a novel food must be fed for up to 12 weeks to see results, relief from symptoms. And it must be fed exclusively, without any treats or flavored medicines.
In the vast majority of cases, a vet will be able to diagnose something OTHER THAN food allergy and be able to help your dog get relief very quickly from itching — whether diagnosing external parasite, fungal, or bacterial infection and treating for that, or providing relief from environmental allergies.
For the environmental allergies, there are hypoallergenic and skin soothing shampoos and rinses, a cortisone shot, oral antihistamines, even a Cytopoint/CADI injection (a drug that can relieve itching within 24 hours and last up to 1-2 months) which has safe use approved for puppies as well as adults. Some dogs with pollen allergies just need a little extra help seasonally.
Throwing up in young dogs can be nothing serious and pretty normal or it can be something that really means your vet should be involved and treating. Joanne is right that it matters also when your puppy does this and what it looks like/consists of, even though that may seem gross!
