I am sorry Sam has these lesions on his feet. Redness in between the pads is common and can be caused by many conditions. The most common cause is an overgrowth of yeast called Malasezzia, this is a yeast normally found on dogs skin but can overgrow if the skin is reactive (typically seen with allergic skin disease) often the feet are itchy too, it can affect any part of the body but the ears are the next most common site for lesions to occur. Treatment is aimed at reducing the yeast population. This is achieved using medicated shampoos containing chlorhexidine. This is available form most vets, but may require an initial examination. Anti histamines can help if the feet are itchy and allergic disease is considered a causal factor, cetirizine 10mg once a day for 14 days may help. Other causes include trauma (walking on hard surfaces) grass seed foreign bodies or excessive chewing from stress or anxiety.
You could try the antihistamines and bathing the feet to see if they settle, otherwise a vet exam maybe needed.
Hope this gives you some pointers,
Apologies for the delay. Cetirizine is a human antihistamine, and comes as a 10mg tablet so one tablet in the food can help
Certainly, white haired/pale skinned dogs can be more representative with regards ***** ***** allergies, the skin will certainly be more sensitive, particular the less haired regions.
The hair loss may be due to him itching the area. It is also a consideration that his anal glands maybe full, this causes varying degrees of irritation centred around the hind limb area and can be associated with thigh lesions or foot lesions from chewing. A vet or groomer can check the glands for you too.
I forgot to say, if it looks like your dog may struggle long term with the skin, a useful supplement to consider are omega fatty acids, often found in fish oils or evening primrose oil.
These help the skin stay strong and can help with mild inflammation.