My puppy is lethargic and suddenly extremely itchy. Her appetite is fine but her head is bobbly and she can only take a

Hello and welcome to Just Answer. This is Dr Mike and it will be my pleasure to assist you with your questions today. I have over 20 years of experience in small animal medicine and surgery. I am sorry to hear that you are having trouble with your little one, I can understand how stressful it is for you. I will do my utmost to assist today and to see if we will be able to resolve this quickly for you. Please be patient with me as it takes time to review and write detailed recommendations. Shortly you will receive an offer from Just Answer for a phone call, this is not directly from me and you do not have to accept it. If you prefer we can continue this whole conversation here. I will begin our discussion today with some questions to better understand your concerns.
To start with, have  there been any changes in eating, drinking, defecating or urinating most recently?
Are there any underlying medical conditions or medications that I should be aware of?
Will it be possible to send some photos of the affected area?

Is the skin red, itchy, any hair loss?

On any flea medication?

Will it be possible to send some photos of the skin and affected areas?

When sending pictures or videos do not text them to this number as it is just message forwarding number. They will then not be sent through for me to review. Instead you can send them through the Just Answer application or attach them to the message line with the paper clip icon or camera symbol. Press the camera or paperclip symbol by the chat box where you type. You may also press the “Add Files” button. Then select your photo(s).
Or you can upload to google drive or drop box and share the link with me here.
The Just Answer app can also be downloaded and it may be easier to then upload pictures/video through the app also.

Any other pets in contact with this one? When did the itching start? Is it getting worse?

This time of the year there can be allergies too, even changes in the environment, they can breathe in the allergens, they then enter the bloodstream from the lungs and also absorbed through the skin. This can then lead to the skin breaking out with reactions like this also. This can develop over time aslo, certain dogs may find over time a certain time of the year this can be more prevelane also. Bathing more often during these time, like once a week can help remove more of the allergens before they are absorbed into the skin. Key is let the shampoo sit on 10 minutes and rinse liberally to remove more of the allergens. Diphenhydramine at 1 mg/pound every 8 hours can also help with itch and inflammaiton.