Hi,
I would use the search box on this forum in upper right side and type in "allergies", many past posts on allergy's...my beagle has severe allergies also, and there is much useful info in those past posts for them. or you could just click on my name and look thru my past posts on allergies.
Also, with the eating/ gaining weight.....beagles are prone to thyroid problems, easily taken care of w/ meds but must have blood test for it. I would have vet do so.
But definitely research this forums past posts, you'll find alot of other ways of helping w/ the allergies, fish oil etc.. before it gets any worse as beagles are prone to this to and they can get severe w/ bacterial/fungal infections as mine did.
Take care, Teresa ; )
my mate has a beagle with skin problems, she started off chewing her tail then moved on to her feet they tried changing her diet etc washin her in special shampoo but in the end the vets was needed they put her on steroids and gave her special shampoo and creams!! it cured it for a while but they are about to take her back cause the allergy is back it seems worse when she goes on grass which is quite hard to avoid!!!
so i would say the vet is needed its horrible watchin them chew and itch