Is it possible for a Pom to change coat shades even at age 4 years
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Depends. What changes have you noticed? For example, almost ALL double-coated breeds (like Poms, Huskies, German Shepherds, etc) will appear to "change color" if shaved or severely trimmed. The hair is not different-colored, it's just that most dogs have lighter undercoat than top coat, and if you shave them the undercoat grows back faster than the top coat.It will eventually go back to the original color if not trimmed again.
Also, many black dogs will fade to reddish-brown if outside in the sun a lot, or if they have a lot of dead undercoat sticking on them that needs to be brushed out.
There is also a "fading" trait that causes black dogs to fade to grey or white, similar to grey horses. All Kerry Blue Terriers have this, but other breeds can too.
I wouldn't worry about Charlie's coat if it is still soft and thick, not harsh or thinning, no matter what color it appears to be.
Bruno CGC answered on 12/9/11. Helpful? / 0
In addition to what Bruno posted, many dogs will get lighter and lighter with each major shed. German Shepherds and many terriers come to mind... with each shed there is more tan area and less black. Poodles are another breed that will lighten up with each new coat. Brown poodles rarely stay brown, most turn to a light coffee au lait color. Silvers and blues are born black and gradually lighten to their respective colors.
All of my "white" poodles were born varying colors of cream and are now completely white except Georgie, who for some reason, gets darker and darker with each shed.
To complicate things ever further, many breeds have a "grizzle" factor which will cause each new coat to have more and more white or gray hairs mixed in. Toto's daughter Pinki has this factor and is almost completely gray at 4 years of age. In her case she is definitely NOT a blue but her gray is the result of more and more white hairs mixing with the remaining black hairs.