1st topic
There are a number of websites posting unfounded tear staining and “red yeast” articles related to Pityrosporum, formerly named Malassezia. However, totally unrelated to yeast, the stains in dog and cat tears result from a BACTERIAL Porphyrin.

2nd topic
From the Pets’ Spark™website FAQ page
Q. Is it safe to feed Pets’ Spark™ to my pet during pregnancy?
A. We do not recommend doing so since no studies were made with dogs or cats during pregnancy.

From the  website
The safety of Tylosin for pregnant or lactating animals (female animals nursing their young) is not known.

3rd topic

Tolerance is established for residues of Tylosin in human edible products of animals such as Chicken, Turkey, Cattle, Swine, Milk and Eggs.

4th topic
For increased rate of weight gain, improved feed efficiency, suppression of estrus (heat), and reduced incidence of liver abscesses, calves in confinement for slaughter are fed Tylosin phosphate. To prevent the avaricious practice of the cattle farmers, worldwide health authorities implemented to the commerce of Tylosin convoluted pharmaceutical and administrative permits, certificates and registrations.

Summary
During the year of 2003, my self appointed mission was to find a way to end the frustration with Aspen, my superb Maltese; who constantly had an unsuitable dirty face.
The research was extensive, evaluating conflicting medical reports from various different countries, understanding the impact and solutions to assorted respiratory diseases in farm raised animals, and all available applications and implications of the Tylosin on animals and human beings, among other questions.

By the end of that year I was solely responsible for the development of the first effective product to eliminate tear stains. www.AngelsGlow.com © 2004 Blanc du Blanc, Inc.
Modifying the formulation of Angels’ Glow™ to counter my competitors’ strategy would not meet my principals.

During the last few years marketing Angels’ Glow™, I have personally addressed customers’ questions and feedback to learn and improve my knowledge. The outcome determined the Pets’ Spark™ formulation to bring the utmost results while faithful to the animals’ wellbeing, with accurate concentration to avoid overdosing and extended use. 
Pets’ Spark™ is the answer to the untrustworthy and unqualified manufactures of obsolete products.

“Our Story” page at https://www.petsspark.com/our_story.php is a synopsis of the process with uncontestable evidence for each stage.

Eliana Ellern
CEO – Petaware, LLC
“Do not believe in words, consider the facts”.