Here are 2 articles that may help you further but you may also look into another product called
diethylstilbesterol or D.E.S. It is a human product that was taken off the market but is still compounded in pharmacies for canine urinary incontinence. The second article below is some herbs and natural remedies though I'm not sure of the effeciancy of them
No well-documented evidence indicates that the use of phenylpropanolamine in animals has produced serious adverse effects. It is possible that hypertension, cardiac arrhythmias, and congestive heart failure could be worsened by phenylpropanolamine because of its action as an alpha- and beta-receptor agonist. These side effects also could develop with the use of other adrenergic agonists. Adrenergic agonists should be used cautiously, if at all, in patients with these problems. Monoamine oxidase inhibitors (MOA inhibitors) and beta-blockers interfere with the action of phenylpropanolamine, and phenylpropanolamine may decrease the effectiveness of vasodilator drugs.
http://www.bobmckee.com/Client%20Info/Misc/Dexatrim.html
Remedies like Hypericum or Causticum and others can be helpful for nerve injuries. Lachesis is a consideration for “surgical menopause” resulting from spaying. See Homeopathic Care for Cats and Dogs: Small Doses for Small Animals by Don Hamilton, DVM on my book page Resources-Media-Books-Holistic Animal Care. It is an excellent resource for homeopathic care. Quoting from the book for urinary incontinence, the following remedies can be considered:
"Bryonia: almost all complaints are worse from motion. If your dog leaks urine while walking (most incontinence cases occur when resting) Bryonia might be helpful.
Causticum: Causticum is by far the most common remedy prescribed for urinary incontinence. It is generally good for any situation when there is muscle weakness and fatigue and the animal is chilly. It is good for old, broken-down constitutions, so it is more likely to help in older, weak animals.
Kreosotum: This is a major remedy for bed-wetting in children and may occasionally be useful for urinary incontinence in dogs, although the conditions are not really equivalent, as bed-wetting is more an emotional problem than a hormonal one. If there is a possibility that your dog's problem is stress or emotional, consider Kreosotum. The urine tends to be irritating when Kreosotum is needed.
Nux moschata: This remedy is especially useful in patients with mental confusion; they may easily get lost in familiar surroundings. Nux moschata also has an affinity to female organs and hormonal problems, including incontinence. These dogs tend to be thirstless with a dry mouth, so they may hang around the water bowl without drinking.
Pulsatilla: Pulsatilla patients have very weak urethral sphincter muscles, so they easily spill urine. In humans, they might leak a few drops of urine when startled or when laughing hard. Dogs may leak urine when excited. They may also leak urine when resting or sleeping. Like Nux moshata and Sepia, Pulsatilla is a good remedy for female organs. These dogs are typically sweet, and they love attention.
Sepia: Sepia animals tend to be rather distant and indifferent to attention. They are also extremely chilly. They may develop incontinence as well, and since Sepia is a good remedy for female hormonal problems, it can be useful for urinary incontinence of hormonal origin."
HORMONAL: Canine Incontinence Support is made by Genesis Ltd., Oceanside, California (877-PETS-4-LIFE, http://www.genesispets.com/products/incontinence.html) "Urinary incontinence may be caused by an underdeveloped urinary system or may arise as a part of the aging process. Estrogen deficiency is the most common cause of incontinence in spayed female dogs and may result in weakened muscles in the bladder and sphincter causing urine leakage. Bovine ovary powder nutritionally provides natural estrogens and works synergistically with the phytoestrogens provided by licorice, wild yam and other ingredients. Research indicates that phyto-estrogens may help strengthen the bladder and sphincter muscles and improve muscle tone."
Fresh Factors is an all natural product made by Springtime, Inc. (www.springtimeinc.com, 800-521-3212). The product is specifically for joint, skin and coat health, and I've seen and heard amazing things in that regard. Interestingly, several of us have also noticed improvement or alleviation of urinary and/or fecal incontinence symptoms in male and female dogs. You may need to have the dog on double the recommended dose (which is safe) for a month or so, then gradually back down 1/4 tablet every week until you find the maintenance dose. For information and testimonials about the product, see my page at Springtime, Inc. To order, call the company.http://www.katberard.com/hea_incontinence.htm
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Let me know if you have any other questions
Good Luck &
Best Fishes