Why is my dog's tongue suddenly red? Is it a concern if she's normal?

Some breeds can have naturally darker tongues, but this looks more like the tongue was bruised or scraped/burned. (Or she licked/ate something that would stain the tongue such as berries) Some illnesses that involve circulation or organ function can also cause the tongue to appear bruised or painful, as well as ingestion of substances that could affect organ function. If she is showing any signs of illness in addition to the change such as vomiting or diarrhea, lethargy, etc, the tongue is very painful or bothersome affecting her ability to eat, she got into something she shouldn't have, or she seems to be having trouble breathing/gasping for air, seeking veterinary care ASAP is best.

If your dog's tongue has changed to a dark gray or purple color than he should be examined by a vet to make sure there isn't a problem. Your vet can do a complete examination, check bloodwork to evaluate his red blood cells, and take an x-ray, if needed. Without an examination, it is difficult to know if there is a problem.

The color of the tongue and gums and skin can change shades based on things like hydration level, blood pressure (which is influenced by hydration and activity level), ambient temperature, oxygenation, red blood cell level, etc. In this case, if Brooke's blood pressure is just a little lower because she has been sleeping, then she may appear a little more pale. Shades of pink are good! White, blue, gray, or purple are bad. But often there can be severe medical issues and the gums can still be nice and pink, so it is rarely a true indication of disease.

His tongue does not appear to be critically discolored or alarming. It is actually quite pink still. If it seems darker to you, you could always take him in to have his blood checked to make sure he does not have any red blood cell abnormalities or clotting disorders. Otherwise, it is too difficult for me to give you an exact diagnosis without examining him. I would have a vet examine it just to be on the safe side if it is still there and you are concerned about it. A hands on exam will give you so much more information than a picture.

It's a little difficult to fully assess Masha's tongue color in the first picture due to the lighting, but in the second picture it looks very normal. As long as Masha is behaving normally otherwise I would not be concerned. If she starts having difficulty breathing, her tongue becomes blue in color, develops a cough, or any other abnormal signs I would have her examined by a veterinarian right away. Thanks for using Petco Pet Education Center, formerly Petcoach!

Colours in pictures can be deceiving but shades of mid pink are normal. Hints of white, yellow, blue or brown require urgent treatment by an emergency vet. If you are concerned a full health check and blood tests would be worthwhile to rule out any indication of illness

I would say that the only thing that really looks pale to me is the tongue and some dog breeds have this genetic tendency so this is also a possibility, i wouldn't be too worried about it, do take her to the vet for a checkup but it is not urgent.