Influence of morning maternal care on the behavioural responses of 8-week-old Beagle puppies to new environmental and social stimuli

In mammals, maternal care represents a major constituent of the early-life environment and its influence on individual development has been documented in rodents, non-human primates, humans and recently in adult dogs. The quality and quantity of mother-offspring interactions exerts a multilevel regulation upon the physiological, cognitive, and behavioural development of the offspring. For example, in rats variations in maternal behaviour, such as mother-pup body contact and the amount of licking towards pups in the nest during the early days after parturition, influences the endocrine, emotional, and behavioural responses to stress in the offspring. This produces long-term consequences, which may remain into adulthood and can be transmitted to subsequent generations. Literature about maternal care in dogs and its effect on puppy behaviour is still scarce, although the topic is receiving a growing interest. The aim of the present study was to determine the effects of morning maternal care on behavioural responses of puppies to new environmental and social stimuli. In order to achieve this, maternal care (licking, ano-genital licking, nursing and mother-puppy contact) was assessed in eight litters of domestic dogs living in standard rearing conditions during the first three weeks post-partum. Puppies were subjected to two behavioural tests (arena and isolation tests) at 58-60 days of age, and their behavioural responses were video recorded and analysed. Data was analysed using multivariate analyses (PCA, PLS).During the isolation test, a higher level of maternal care was associated with more exploration and a higher latency to emit the first yelp; on the contrary, a lower level of maternal care was associated with increased locomotion, distress vocalisations and destructive behaviours directed at the enclosure.These results, comparable to those reported in laboratory rat models and to some extent to those recently reported in dog literature, highlight the importance of maternal care on the behavioural development of domestic dog puppies

Development of the dog attachment insecurity screening inventory (D-aisi):A pilot study on a sample of female owners

SIMPLE SUMMARY: The Strange Situation Procedure is a laboratory test originally designed to assess the quality of a child’s attachment bond to their mother and is widely used in dogs to assess their attachment bond towards the owner. However, the SSP is time consuming and limits the amount and variety of obtainable data. In order to overcome these limitations, we adapted a three-dimensional parent-report scale, named the Attachment Insecurity Screening Inventory (AISI) 6–12, originally developed to assess 6- to 12-year-old children’s attachment insecurity, to dog–owner dyads, and we assessed scale consistency and validity. A first statistical analysis performed on the responses provided by 524 female owners to the online questionnaire revealed five scale dimensions named “physical contact”, “control”, separation anxiety”, “owner as emotional support”, and “owner as a source of positive emotion”. However, a further forced extraction of three components resulted in subscales that mirrored the ones reported for the original AISI in terms of item composition (i.e., ambivalent, avoidant, and disorganized). The three subscales also had satisfactory to good measures of internal reliability. The final scale was named the Dog Attachment Insecurity Screening Inventory (D-AISI). Although promising, it needs to be refined and tested for more validity measures. ABSTRACT: To date, the Strange Situation Procedure is the only tool available to investigate the quality of the dog’s attachment bond towards the owner. This study aimed to adapt a parent-report scale, named the Attachment Insecurity Screening Inventory (AISI) 6–12, originally designed to assess 6- to 12-year-old children’s attachment insecurity, to dog–owner dyads and assess measures of consistency and validity. The online questionnaire was completed by 524 female dog owners. Principal component analysis (PCA) revealed five components named, respectively, “physical contact”, “control”, “separation anxiety”, “owner as emotional support”, and “owner as a source of positive emotion”. Because of the three-factor structure of the original AISI, a PCA with a pre-fixed set of three factors was also performed. The resulting subscales mirrored the ones found for the original scale (i.e., ambivalent, avoidant, and disorganized), although four items did not fit the model. Internal reliability appeared to be satisfying for the ambivalent and the disorganized subscales, and good for the avoidant subscale. The theoretical background and the results of this study suggest that the three-dimensional model represents a better solution for the interpretation of the Dog Attachment Insecurity Screening Inventory (D-AISI). Although promising, this scale requires refinement and assessment of additional validity measures

Strontium-Substituted α-TCP: Structure, Stability, and Reactivity in Solution

& alpha;-Tricalcium phosphate (& alpha;-TCP) is widelyused as acomponent of bone cements, and many efforts have been made to dopeit with strontium ion (Sr), which is known for its beneficial rolein bone tissue. However, the range of possible substitution of strontiumfor calcium (Ca) into & alpha;-TCP, as well as its effect on the & alpha;-TCPstructure, has not been clarified yet. Herein, we investigate thissubstitution through the examination of & alpha;-TCP synthesized athigh temperatures in the presence of increasing amounts of strontiumaccording to two different routes: 1-step and 2-steps. The results show that Sr can enter into an & alpha;-TCPstructure up to about 10 atom % and substitutes for calcium mostlyat specific cation sites, namely, M(5), M(11), and M(17), characterizedby relatively low bond valence sums and long mean Ca-O distance.Strontium presence stabilizes & alpha;-TCP delaying its transformationinto octacalcium phosphate and hydroxyapatite in H3PO4, as well as in physiological solution. Although the two methodsof synthesis provide similar structural results, the products of 1-step synthesis display a slightly smaller crystallitesize and greater solubility and, as a consequence, a faster hydrolysisreaction.& alpha;-Tricalcium phosphatepreparation through the solid-statereaction is described following two different procedures. The investigationof the range of possible substitution of strontium for calcium into & alpha;-TCP as well as its effect on the & alpha;-TCP structure ispresented. Furthermore, it is shown that strontium presence stabilizes & alpha;-TCP and delays its hydrolysis reaction into octacalcium phosphateand hydroxyapatite

Synthesis and Hydrolysis of Brushite (DCPD): The Role of Ionic Substitution

Brushite (dicalcium phosphate dihydrate, DCPD) is considered one of the possible precursors of the apatitic phase that constitutes the mineral component of bones, and it is often utilized in the preparation of biomaterials for hard tissue repair. In this work, we investigated the influence of ionic substitution on the synthesis, structure, and morphology of this calcium phosphate, as well as on its hydrolysis process. The results of structural refinements indicate that the range of possible substitution can reach values up to about 38 atom % for the big Sr ion, whereas it is quite limited for Zn, Co, and Mn. In particular, DCPD cannot be obtained as a single phase in the presence of zinc ions in solution. The kind and amount of substituent ions significantly influence the morphology of DCPD, promoting aggregation and crystal shape modifications, as well as its hydrolysis in solution. The results provide useful information for the understanding of the mineralization processes and for the design of new biomaterials

Cats and dogs: Best friends or deadly enemies? What the owners of cats and dogs living in the same household think about their relationship with people and other pets

Although popular culture describes them as mortal enemies, more and more often, dogs and cats live under the same roof. Does this make them best friends? Can sharing the same social and physical environment make them similar? This study compares the approaches of dogs and cats living in the same household have towards humans and other pets as perceived by the owner. Questionnaires collected from 1270 people owning both dog(s) and cat(s) were analysed. Most dogs and cats living together are playful with familiar humans (76.2%) but dogs have a more sociable approach towards strangers and conspecifics than cats (P<0.001). Moreover, the percentage of dogs that have a playful relationship with the owner (84.0%) was higher than cats (49.2%; P<0.001). Dogs and cats living together eat in different places and show different mutual interactions: more dogs lick the cat (42.8%) and more cats ignore the dog (41.8%) than vice versa (P<0.001). However, most dogs and cats sleep at least occasionally (68.5%) and play together (62.4%; P<0.001). Although some body postures, such as the tail’s position, are interpreted differently by the two species, the greater proportions of dogs and cats show a relaxed response to several kinds of approaches of their roommate. Our questionnaire confirms the common beliefs about the sociability of the dog and the privacy of the cat, but this does not result in continuous internal struggles. Most cohabitations are peaceful. Moreover, it is true that they speak different languages, but they seem to understand each other well and interpret each other’s approaches in the right way. Thus, aspiring owners should not blindly believe popular assumptions, but both knowledge and respect for species-specific pet behaviours are essential to establish a balance in the household

The impact of chronic inflammatory enteropathy on dogs’ quality of life and dog-owner relationship

This research was aimed at evaluating the impact of canine chronic enteropathies on dogs’ quality of life (QoL), their behavior, and owner–dog relationship. Forty-four dogs suffering from primary chronic enteropathies were assessed on the first visit with a veterinary gastroenterologist and on the first follow-up visit using a 1–10 visual scale to evaluate five features of QoL, the Canine Chronic Enteropathy Clinical Activity Index, the Lexington Attachment to Pet Scale, and the Canine Behavioral Assessment and Research Questionnaire. They were compared to a control group of 49 healthy dogs and to a group of 50 dogs suffering from cancer. QoL and severity of enteropathy were negatively associated; enteropathic dogs on the first visit had a lower QoL than healthy dogs for all features and a lower general QoL than cancer patients; enteropathic dogs on the follow-up visit improved significantly for general QoL, health QoL, and interaction QoL. Higher levels of attachment between the owner and the dog were obtained for dogs affected by chronic enteropathies. Finally, dogs showed higher scores for separation-related behaviors and contact/attention behaviors on the first visit than on the subsequent follow-up. As in human medicine, chronic enteropathies have a strong negative impact on dogs

Partial analytic validation of determination of cortisol in dog hair using a commercial EIA kit

The quantification of cortisol in hair samples is a relatively recent method that has been increasingly used for the evaluation of long-term cortisol secretion and chronic stress levels, in both humans and non-human animals. The use of hair presents many advantages in relation to the use of other biological matrices, e.g. a very low invasiveness of the sample collection. Besides, cortisol analysis in hair samples provides measurements over a long period of time, which can be used as a chronic stress indicator. Nevertheless, the physiology of cortisol in hair and the evaluation of reliable methods for its quantification in hair samples need to be further investigated. The aim of this study was to perform a partial analytical validation for the quantification of cortisol in domestic dog hair samples using a commercially available high sensitivity salivary cortisol enzyme immunoassay kit. Results on both precision and linearity tests were overall favorable, supporting that the kit can be used to reliably measure hair cortisol concentrations in dogs

“Three-bullets” loaded mesoporous silica nanoparticles for combined photo/chemotherapy

This contribution reports the design, preparation, photophysical and photochemical characterization, as well as a preliminary biological evaluation of mesoporous silica nanoparticles (MSNs) covalently integrating a nitric oxide (NO) photodonor (NOPD) and a singlet oxygen (1O2) photosensitizer (PS) and encapsulating the anticancer doxorubicin (DOX) in a noncovalent fashion. These MSNs bind the NOPD mainly in their inner part and the PS in their outer part in order to judiciously exploit the different diffusion radius of the cytotoxic NO and 1O2. Furthermore this silica nanoconstruct has been devised in such a way to permit the selective excitation of the NOPD and the PS with light sources of different energy in the visible window. We demonstrate that the individual photochemical performances of the photoactive components of the MSNs are not mutually affected, and remain unaltered even in the presence of DOX. As a result, the complete nanoconstruct is able to deliver NO and 1O2 under blue and green light, respectively, and to release DOX under physiological conditions. Preliminary biological results performed using A375 cancer cells show a good tolerability of the functionalized MSNs in the dark and a potentiated activity of DOX upon irradiation, due to the effect of the NO photoreleased