Experienced and professional animal trainer provide their insights in answering this question :
A. Viscous whitish urine is normal in rabbits, especially when it’s only occasionally. if it’s all the time like this – this might be a sign of the beginning of bladder stone formation. in this case it is advised to add vitamin C to their diet.

How to Identify Common Pet Problems ?

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Healthy rabbits excrete excess calcium salts via the renal system, and this can give the urine a chalky or opaque appearance. The urine will often dry to a white, chalky residue.
Pasteurella (Snuffles)

In its respiratory form, it is often known as `snuffles`, as the rabbits have a milky nasal discharge which hinders nose breathing. They often have a similar condition in the eyes causing conjunctivitis and may have pneumonia as well.

This `sludge` can build up for a variety of reasons and is an indicator of an underlying problem. What signs to look for in your rabbit: Painful or difficult urination • Thick, pasty beige-brown coloured urine – could be mistaken for diarrhoea!
Clinical signs can include weight loss, gradual reduction in appetite, increased urine production and increased water consumption. The rabbit may lose body condition and generally look `unwell and scruffy`. A clinical examination will detect small `shrivelled` kidneys which may feel irregular in shape.
Calciuria, the accumulation of calcium “sand” in the urinary tract of rabbits, is recognized with increasing frequency. This syndrome is related to the consumption of excessive dietary calcium. Absorption of calcium in rabbits is unique because there is almost complete intestinal absorption of all dietary calcium.
An imbalance of the normal bacteria and fungi in the gastrointestinal tract is a common reason this can occur. In young rabbits, we get concerned that parasites can cause this imbalance leading to poor nutritional absorption, which can result in changes in the character of the stool such as the clear gel you observed.
The clinical presentation of pasteurellosis in rabbits includes upper respiratory tract disease (rhinitis, sinusitis, conjunctivitis, lacrimal duct infection), otitis, pleuropneumonia, bacteremia, and abscesses of the subcutaneous tissues or internal organs, bones, joints, and genitalia.
If you see a red or pink color in the urine (orange is OK) and there are no other symptoms, you could wait until normal office hours and ask your veterinarian to test the urine for blood. If you see your rabbit straining to urinate, but there is no urine, go to a veterinarian as soon as possible.
Normal rabbit urine can range greatly in color. It can be pale yellow, dark yellow, a range of oranges, browns, and even rusty red. There are many factors including genetics and diet. Even though it ranges in color, normal urine is always watery and not thick.
Most cases of bladder sludge do not require surgery unless there is a blockage present. Catheterization and flushing of the bladder – Bladder sludge is usually treatable by anesthetizing the bunny, placing a catheter into the bladder and flushing the bladder with saline to dilute the sludge material.
It is relatively easy to diagnose diabetes mellitus; a simple drop of blood on a glucometer (a device for determining the approximate concentration of glucose in the blood) showing a high blood glucose may indicated diabetes mellitus.
To diagnose a kidney infection, your veterinarian will first observe whether your rabbit is exhibiting unproductive squatting that does not lead to effective urination. The doctor may note that urination is incomplete, or leads to the passing of cloudy or dark-colored urine.
Treatment. Rabbits that have been diagnosed with a urinary tract infection are usually treated as outpatient. Affected rabbits often respond to a combination of antibiotic therapy, increased water consumption, dietary modification, weight loss, and an increase in exercise alone.
Normal rabbit urine will vary from a pale yellow or clear colour, through various orange and brown colours, right up to a deep red colour. Rabbit urine may also look cloudy due to the presence of calcium carbonate being excreted within the urine.
Thick, white discharge can occur throughout your menstrual cycle. This discharge is known as leukorrhea, and it`s completely normal. The discharge may start out thinner in the days leading up to ovulation, or when an egg is released. During ovulation, the discharge or mucus may become very thick and mucus-like.
Symptoms will vary greatly depending on what the cause of your rabbit`s snuffles are. The main symptom you may notice your rabbit is experiencing is going to be discharge from his nose. This may be anywhere from a thin, clear discharge to a thick white mucus.
Rabbits, hares, and rodents—Clinical signs in rabbits, hares, and rodents have not been well described, because affected animals have most often been found dead. Experimentally infected animals exhibit weakness, fever, ulcers, regional lymphadenopathy, and abscesses. Death usually ensues in 8 to 14 days.
A. Tularemia, also known as “rabbit fever,” is a disease caused by the bacterium Francisella tularensis. Tularemia is typically found in animals, especially rodents, rabbits, and hares. Tularemia is usually a rural disease and has been reported in all U.S. states except Hawaii.
Limp, floppy or cold – If your rabbit sits hunched in a corner and feels funny when you pick him or her up, you have a very, very sick animal. This weak, floppy condition, often accompanied by cold ears, indicates severe dehydration, shock or sepsis.
Goldenseal is another immune boosting herb for rabbits. It`s an effective anti-inflammatory treatment for rabbits who suffer from frequent infections. Goldenseal also has properties that help in treating bladder infections by acting as a natural antibiotic.
One of the most common bacteria that colonizes the oro-pharynx and the upper respiratory tract of rabbits is Pasteurella (P.) multocida. Transmission of the infection to humans results from scratches, licks, and bites but it also can occur from the inhalation of air particles containing the microorganism.
Rabbits can suffer from bladder conditions such as cystitis. Cystitis is inflammation of the lining of the bladder. This can be caused by bacteria, but it can also be triggered by the presence of sludge in their bladder.
Outlook (Prognosis) Most bladder stones pass on their own or can be removed. They do not cause permanent damage to the bladder. They may come back if the cause is not corrected.
Rabbit urine can be removed from most surfaces using pure white vinegar or a diluted white vinegar solution. Tough or dried stains may need some time to soak, or they will require the use of stronger chemical cleaners.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Q. My rabbit is discharging very white and viscous urine occasionally. Is anything wrong?? She is active.
ANSWER : A. Viscous whitish urine is normal in rabbits, especially when it’s only occasionally. if it’s all the time like this – this might be a sign of the beginning of bladder stone formation. in this case it is advised to add vitamin C to their diet.

Q. Male neutered cat [1 1/2 years old] has just started trying to spray everywhere around the house. Nothing is coming out. No recent changes.
ANSWER : A. Changes in urinary habits can be caused by a number of things, especially in neutered male cats. Attempting to urinate or have accidents in places other than the litter box can often be a sign of a urinary tract infection, or crystals and debris in the bladder causing problems. Pets may need to go more frequently, may dribble or urinate in small amounts more often, may have accidents or may have blood-tinged or cloudy urine.Infections are usually treated with medications and changes to the diet, however in some cases of large stones or crystals surgery may be needed.

Male cats can also experience urinary blockage. This is due to a unique anatomical part or the urethra that forms a U-shape before exiting the body in male cats. If a cat has crystals or other debris in the urine, it can block at this point preventing urine from being able to exit. Cats may attempt to urinate without producing anything, may become very vocal (indicating pain) or may have a hunched back, full abdomen or pain in the abdomen (protecting the very full bladder). Urinary blockage IS a medical emergency so if suspected, your vet or local emergency clinic should be contacted immediately. Treatment usually involves a hospital stay and catheterization of the bladder to remove the blockage and allow urine to drain followed by medications and a change in diet to prevent further problems.

It is best to try and collect a sample of urine and make an appointment for your cat if he has had a change in urinary habits. If you do suspect a blockage, then contact your vet ASAP is best.

Q. What can a human get from a rabbit? What illness can a human get from a domesticated rabbit?
ANSWER : A. Actual diseases passed from rabbit to human is rare. the most common issues are allergies to rabbits and infection from a bite or scratch.
Wild rabbits may pass on salmonella but this is rare and even rarer in domestic rabbits. The only other thing is mites. some rabbits suffer from cheyletiella which can be transmitted to humans.

Q. We have 2 cats and got 2 rabbits yesterday. 1 rabbit died with probably E.Cuniculi. How at risk are our cats? What can we do?
ANSWER : A. This parasite is dangerous only for rabbits. Your cats are safe but the other rabbit can get the parasite. Disease is spreaded by urine and hay or litter contaminated with urine. Keep the rabbit in separate new cage with new litter. If you will notice any sign of infestation ( opthalmological or neurological) see a vet as soon as possible

Q. My female dog urinates well and then she will squat in different places
ANSWER : A. If your dog is having accidents in the house, or is attempting to urinate frequently, going small amounts often, or has cloudy or blood-tinged urine, it may indicate a Urinary Tract Infection. Bringing her in along with a sample of her urine is best to check for this common issue and rule out any other causes of the constant urination. Your vet can then provide treatment such as antibiotics or a urine-friendly diet to help her feel better.

Q. My dog is urinating a lot but she could be laying down and she urine come out . is this urinating tract infection
ANSWER : A. Female Dogs that dribble urine especially while they are sleeping usually have urinary incontinence. This is when the muscle that holds the urine in the bladder becomes weak and therefore leaks. There is medication you can get from your veterinarian after your pet has had an examination and testing to rule out any underlying diseases like a urinary tract infection which occasionally will cause this problem.

Q. Our yearling miniature horsefillies keep urinating white our vet can’t tell us why. This has been going on periodically since they were 5 months old.
ANSWER : A. Some tests are necessary to find out what is wrong. Basic examination include fresh urine sample tests, microscopic exam of the urine and examination of reproductive tract with Lab work of the discharge.

Q. have a male rabbit non neutered likes to run and spray urine everywhere have other male next to n separate cage cant see eachother still sprays why
ANSWER : A. This is normal territorial behavior. Neutering both rabbits will likely prevent this behavior. He may not see the other rabbit, but he can smell the other rabbit, so therefore is telling the other rabbit he is here and that the area is his kingdom.
Here is great information that should help you along: http://articles.extension.org/pages/33013/rabbit-behavioral-problems:-inappropriate-urination