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(Another member will step in for a better explanation) not all liver horses have DP. The super dark livers and the black liver horses usually have 1 to 2 copies (2 being the black liver)
The only solid way to know you have a horse with DP is to get a "freaky friday" herd helper, which comes out every Friday the 13th. All horses are homozygous for DP. I'd you breed to freaky Fridays together you will get a colt that is also homozygous for it. If you breed a freaky Friday with a regular horse the foal has a chance of getting 1 copy and a smaller chance of getting 2 copies.

For example:

My freaky Friday mare Vi is hm for DP


She has 3 foals. One is an uneven bred mare
Photogragh

She is a not DP. Her sire doesn't have it and her foal doesn't have any signs of having it either.

Shiz Niz is a liver red roan roan and he has 2 copies of sooty and 1 copy of DP. His sire was a foundation like his mum but not a DP carrier


Her last colt is Bizarre, he is a very dark silver brown. He carries 2 copies of sooty as well as 2 copies of DP. His sire is a freaky Friday stallion


I am not an expert on DP, so I can only make a generalized guess at what Vi's babies actually carry (except Bizarre, I know he is hm for sooty and DP)

Sorry y'all, but Confluence and Color Good are wrong. Every horse that qualifies for the Liver club carries at least one copy of DP. This means that as long as you are breeding chestnuts, palominos of red duns, it's really easy to know whether or not your horse carries DP,

Life gets more complicated if you are breeding other colors like champagne, bay, brown or double dilutes. Then you really have to have "an eye" for it or you have to be lucky to get the right combination of genes to get a red foal that qualifies for the liver club.

All horses that qualify for the Liver club have at least 3 darkening alleles across the 2 darkening genes (4 alleles total). The genes are sooty and DP, so when you color test you will be able to see your sooty genes but have to guess about your DP.

"Normal" Liver is 3 darkening alleles, while "black" chestnut is 4. I find it a little harder to identify 4 darkening alleles in palominos and red duns, but comparing them to horses where you know exactly what they carry can be helpful.

Freaky Fridays are all known to have 4 darkening alleles, and the other RS with known DP is the Kings Ransom. Obviously as Amber or sable champagnes, they don't qualify for the club, but it's there,

I personally find that if I get one of the dark chestnut or sooty palomino HHs and use all of the creates, there are often one or two DPs. Of course, it seems like those are usually the ones that get snipped....

DP is also in the GMT lab permanently now, so you always have that avenue to create foundation stock with known DP if you want to use it. I have 3 foundation red stallions with 4 darkening alleles and two foundation bay/browns that also carry DP, so I have a lot of it in my herd.

Dena what you said I felt was wrong is that you can't be sure you have DP unless you get a Freaky Friday! I think it's much easier to identify DP than that. Tho certainly the gene vs allele terminology can get tricky...

There is one other new rank special HH that guarantees DP. The Dark Chocolates are chocolate palominos (SstySsty DP).

Here are some examples to help you see the differences that allow you to spot DP in various red based colors:

Ordinary dark chestnut SstySsty no DP (SstyS with DP would look like this also):

http://hj2.huntandjump.com/horse.php?horseid=375794

Liver chestnut SstySsty DP:

http://hj2.huntandjump.com/horse.php?horseid=499207

"Black" liver chestnut SstySsty DPDP:

http://hj2.huntandjump.com/horse.php?horseid=499220

Dark palomino SstySsty no DP:

http://hj2.huntandjump.com/horse.php?horseid=488779

Chocolate palomino SstySsty DP:

http://hj2.huntandjump.com/horse.php?horseid=480433

Homozygous DP Chocolate palomino:

http://hj2.huntandjump.com/horse.php?horseid=480438

Dark red dun roan SsytSsty no DP:

http://hj2.huntandjump.com/horse.php?horseid=396731

Liver red dun roan SstySsty DP:

http://hj2.huntandjump.com/horse.php?horseid=440108

Homozygous DP liver red dun roan:

http://hj2.huntandjump.com/horse.php?horseid=440258

Gold champagne roan SstySsty no DP:

http://hj2.huntandjump.com/horse.php?horseid=410670

Gold champagne roan SstySsty DP:

http://hj2.huntandjump.com/horse.php?horseid=440134

Gold champagne roan Freaky Friday SstySsty DPDP:

http://hj2.huntandjump.com/horse.php?horseid=434335

I can't believe I forgot the dark chocolates too! I also remember being told about all horses registered in liver having DP, clearly forgot about that lesson XD

You probably have heard the statement that the best way to learn something is to teach it to someone else. :D