Oh dear, poor you - baby animals are a mixed blessing, aren't they?! Quoting from K & A's book, they say that with any accident, move quickly before the urine has soaked through. Limit absorption by applying paper towels. After absorbing as much as possible, dilute the spot first using a cloth dampened with cold water or soda water, then clean with an acid solution of 3 parts soda water to 1 part white vinegar. Finish cleaning with an ammonia solution (1-10 ratio with water) then rinse.
For older stains add a small amount of washing up liquid to a bucket of warm water and 1 cap of chlorine bleach or household ammonia and apply with a clean cloth. Next cover with a dry white towel or disposable kitchen towel and "do the dance of joy" on the towel to absorb the moisture!
Distilled white vinegar sprayed on the spot also removes identifying odours.
If the spot has seen multiple accidents, the bacteria breaking down the stain may actually create a concentrated alkaline state that interferes with the enzyme digester's effectiveness, but after it has been sworking for about 4 hours neutralize the spot by mixing a solution of 1 cup vinegar to a gallon of warm water. Rinse the area with vinegar solution. Finally apply a fresh batch of bacteria/enzyme digester solution.
Their star tip is to use biological washing powder containing enzymes to break down ammonia in the urine and neutralize odour, or enzyme digesters (from pet shops) to banish the smell. Read fabric labels to check enzyme digesters can be used.
Hope this is of some help, and good luck!
CQ forever!