DOG IMO the best and most accurate method would be centysis (not sure of spelling?) they remove it with a needle and you wont risk contamination usually. Getting the sample yourself can be tricky if its not sterile. They also have a litter which is disgusting but its called NOSORB.
I feel your pain on the inappropriate peeing. Tabitha destroyed the hardwood in out master bedroom. Its now on the to do list! good luck!
After trying many times to get a sample we found the first method was the easiest and each time Tabitha was not bothered by their method of collection.
Tabitha April 10, 1995 - August 23, 2013
Bomber April 10, 1995 - July 12, 2010
Winston Nov 15, 1999 - September 15, 2011
Sophie Aug 30, 2011
"UNTIL ONE HAS LOVED AN ANIMAL, PART OF THEIR SOUL REMAINS UNAWAKENED"
He is your friend, your partner, your defender, your dog. You are his life, his love, his leader. He will be yours, faithful and true, to the last beat of his heart. You owe it to him to be worthy of such devotion.