Dogs suffering from contact dermatitis will most likely suffer from rashes and/or bumps which occur on the skin that has come in contact with the ground (i.e., the chin, neck, chest, abdomen, groin, anal area, scrotum, tail, and between the toes). These rashes may stop abruptly at the hairline. Other common symptoms include itching, which is usually severe, and swelling.
Factors and/or substances that have been reported to be skin irritants for human, but also for animals are:
Carpet and litter deodorizers
Sensitivity to the sun/heat
Fungal infection (e.g., ringworm)
Parasitic hypersensitivity or infestation (e.g., mites, fleas)
Insecticides, including newer topical flea treatments
Skin problems in for example dogs can express themselves differently
itch - scratch
but also flapping ears - scratching the ears
shaking their head
licking of the legs
biting the legs
redness or discoloration of the skin
odor - smelly skin
There you will find a number of causes for skin problems in dogs.
parasites, food allergy, bacteria, fungi, atopy, yeasts.
A dog with severe itching symptoms may suffer from flea allergies.
Fleas cause an extremely annoying itch with all its consequences, as the fleas bite than irritate it.
This results that the dog suddenly turns and bites into the coat or they scratch themselves with their hind legs.
Some animals are sensitive to the saliva of the flea. After several bites a certain limit is exceeded, causing an allergic reaction occurs. Older bites are then activated so that the animal receives an enormous amount of itching. They scratch and bite themselves bloody. A bite per week is already sufficient in order to maintain this process.