Don't over think it, it's pee for heaven sakes LOL,

Mac nailed it, good post sir.. Never say never, never say always especially with wildlife.. especially predators..

Yes sir was kind enough to send me a small bottle of quality coyote urine and I had a chance to test it out on my pup today. Sad to say I got no/little response or interest from him this afternoon. Tried all 4 with the same results, could'nt even get him to roll in it like last time. I plan on taking some along on our evening walk to see if I get any other responses from him. Mind you he is only 15 months old terrier/english shepard cross but has had the chance to meet a few coyotes in person last fall on my line. He was cautious but interested and doesn't get rialed like he does with raccoon, woodchuck and such. As of now I'm not sure if it's the urine or the dog.....

Probably the dog. I found that to be true with a few dogs on my urine test. It was the same on some lures and those same dogs.
But of coarse It might have been that all those dogs were on leashes.